I tried to edit my original comment, but the editing was turned off. My comment was not intentionally snarky but based on my experiences in 2008. At that time, there were many subprime mortgages floating around that should've never been written. Those taking the risk (financial institutions) should've taken the fall, but instead, they pushed the losses onto the homeowners.
Your last paragraph needs more nuance because the real world is messy. There are many factors ranging from inadequate income for savings and personal scale disasters like divorce and medical bankruptcy that prove your claims are inaccurate. However, I think your last paragraph is a passionate disapproval of people living in ways different from you. Some of your points are valid on income inequality, power structures, and transit, but the reality is what we live with today. If you look at the practical realities, widespread transit changes and housing densification are not likely to happen any time soon.
If you want to make change now, join your city government. Promote a plan to destroy old properties and replace them with denser, more environmentally sound buildings. Fix the core of the city before you try to change the way anybody else lives.
An easier path is engineering and product development of solutions that make what we have now less destructive.
If that's too big, here is a simple change that significantly impacts people and natural life: Turn off the lights. If you can't do that, make them fainter and warmer (2800K) and point them at the ground. Light pollution substantially negatively impacts the environment and the health of people and animals.
Another small change is nudging people to rewild their lawns. This would have a huge impact on insects, birds, and small mammals. It's a simple change: change a little bit of the zoning laws to reward native plant use and punish the use of invasive and other non-native plants.
It's important to recognize that if you can't make a small change happen and stick, the big stuff is a non-starter. This is true for personal change as well as societal change. A small change is a big change.
--- Your friendly country mouse