I am concerned about crime. Once you start to have more stuff than people around you, I get the impression people adopt the view that any trouble they cause me is something I can easily handle because I have more money than them. Someone hit my $150,000 car in a coffee shop parking lot a few weeks ago and didn't leave a note (and I always park correctly in the lines). I'm going to assume they couldn't afford to fix it so I'm not going to be angry, and I'm not going to avoid going to coffee shops because of it, but it was still annoying to be out the $1500 deductible to fix it. And the last time I left the tiniest black mark on someone's door from opening mine too fast, I still left a note.

I've seen a reddit AMA by an ex-thief who justified stealing from houses because the owners obviously had a lot of money and wouldn't miss anything they took.

Other types of people with no money, such as college students in west campus, seem to have a knack for getting drunk and breaking stuff.

People with less to lose seem to think less about the consequences of their actions and seem to adopt the view that people in different income classes don't have problems. And there appears to be resent there. I just can't imagine someone making $100k to $300k trying to steal the wheels of their neighbor's car or steal the tomato plants from their backyard.

You could say "well just move to a richer area". But this conversation is a bout advocating allowing cheaper development in area, so what's to stop that richer area from becoming a dense, cheaper area.