Hedonism is good fit for your question.

An individual whats to live in a place where others live under the banner of truth, justice, and love. But, that same individual sees that by making compromises (lying cheating, bullying) they can improve their own situation as they see things. They don’t see this as compromising the society just improvements to their immediate surroundings.

The end game. Improvement of where one sees oneself. Small picture rarely affects the big picture. Brownian motion would indicate that just because a few individuals moving against the whole does very little as long as all individuals are similar in size. Of course, this changes as the individuals are larger or more influential but again it takes a lot to change course.

Looking back at most structures, about 70% of well-maintained structures will last for between 100–120 years with modern methods. For every 10 years beyond that you’ll lose about 10% of the remaining.

For average maintained structures only about 50% make it to 100 years with the same 10% loss each additional 10 years.

Poorly maintained structures become shacks in 30 years or less.

Abandoned structures become shacks from 6 months to 5 years depending on the climate.

Pretty much stone is the answer.

Other materials would exist but may change.

Stalinist architectural style.

The style is much harder to define on an individual building scale unless your focus is one of the state buildings or the Soviet Academy of Architecture. Mostly it shows on an urban planning scale. Long parklike boulevards lined with housing blocks ending in huge plazas and major monuments or buildings at the ends of boulevard views.

Building exteriors used a lot of brick, terra cotta or unit concrete over nearly any kind of structural system. A lot of small windows. Imagine everyone placing a brick to build each building and enough windows so everyone got a window. This was the triumph of the common man, all of which are equal. Every element was to showcase the new social order of the many coming together to create greatness and every view to show the monuments the new order had accomplished.

But, outside the grand streets communism showed itself as massive project-like housing structures. The masses in cities were to work in factories, and factory-like construction was used to house them.

The large city centers were used as propaganda to the state that looked like modern classical buildings towering into the sky. Everywhere else was brutal mass-produced buildings that went on as far as the eye can see.

Since we build out of materials already present on/in the Earth no. The total mass of the Earth hasn’t changed, so no change to the gravitational force.

Naturally occurring? Probably not.

You need existing ice to be exposed to something like 3GPa. By increasing the pressure you’re generating heat. A lot of heat. So a separate system would need to be present to get rid of said heat or to start in a cold enough environment.

So three problems as I see things:

1. No place cold enough to maintain solid ice throughout the pressure increase.
2. No naturally occurring system to cool down ice throughout the pressure increase.
3. Places on/in Earth that have that kind of pressure are too hot to maintain ice.

So, your kind of left with laboratories.

Sorting and identification.

Additionally, some of the decision making, but this is largely related to the above items.

If an object has mass, Earth supplies the gravity, ergo you have weight.

Gravity would feel weightless.

You probably wouldn’t notice as the pressure would be sufficient to crush you into a small super-heated ball.

Firstly, you may have noticed that your body is in contact with the ground now. So, we are already there.

I think the question you mean to ask is how much more gravity would be required before you would be unable to stand or move about freely.

This largely depends on two things. How much do you weigh now, and how strong are you?

Most people experience trouble at 2G. The average person weighing in at 150lbs would weigh 300lbs. A healthy person could stand, but walking could cause major injury.

At 3G the same person would weigh 450lbs. Only a very strong person could walk. Most people could not move their bodies. Sick, elderly people and very young people may not be able to breathe.

At 5G the same person now weighs 750lbs. Only athletes would be able to maintain consciousness for more than a few minutes. Death would be certain for anyone exposed long term as their heart would be unable to circulate blood throughout their body, and most of your organs would fail under this pressure. Breathing would eventually break your ribs, which in turn would prevent your ability to breathe.

At 10G the same person now weighs 1,500lbs or 3/4 of a ton. Athletes would be unable to count to ten before lossing consciousness. Life would be unlikely sustained for an hour. Liquids within your body would seperate into different density materials within a short period of time.

At 20G the same person now weighs 3,000lbs or 1.5 tons. Life would be measured in seconds. Liquid displacement within your body would visibly show swelling in the lower portions of the body. Lower body parts would quickly turn black.

At 50G the same person now weighs 7,500lbs or 3.75 tons. You are near or at the limit of instant death. A typical person has a profile of 5.5 sqft. You now weigh enough that if you were to be placed on typical solid earth at 1G you might cause the dirt you were placed upon to start to collapse with you sinking as much as foot into the ground.

At 100G the same person now weighs 10,500lbs or 5 tons. Your bones easily push through your skin. Long term, even your bones will crumble under the strain. Your weight crushes most lightweight materials. It requires bedrock, stone, thick concrete or steel to support your weight.