I find there are a number of things I cannot do without someone having a car. 1) Go hiking, snowboarding, mountain biking 2) Drive fast on road courses 3) Come home from the airport after midnight 4) Purchase more than 2 bags of groceries (including TP, laundry detergent et al) 5) Go on road trips 6) Isolate myself from the mentally ill or obnoxious behaviors and smells I'm surrounded by, including their fecal matter…
Have you considered that "isolating" yourself from the people in your community who are most in need has had a negative impact on both you and your community? And that you may vastly overestimate the presence of crime and homelessness because of this isolation? As someone who does take public transit on a daily basis and occasionally interacts with the homeless and petty criminals, the dehumanization of people in you…
Some people don't like other people. Regardless of whether my neighbors are nice people who have an excess of delicious baked goods or meth addicts, I don't want to interact with them and I have no obligation to them just because of our proximity.
It's perfectly okay to not like being around people, especially people with obnoxious behaviors (whether they are because of a mental illness or otherwise) or people that smell bad.