Never seen the movie, but gangs/criminals don't pay much in taxes so that gives them a big leg up for one thing. The criminal's 100 k income is worth a lot more than a professional's 100k. Plus gangs often times have the whole boarding house situation going on. Buy a decent sized pad, throw half the gang in there to help with bills. A lot of gangs have been priced out in some ways though too. For instance, about an hour away from Los Angeles is a place called San Bernardino that's a gang ridden dump now, but it was supposedly nice back in the day. No doubt a lot of previous residents of Los Angeles hoods helped turn it that way.
Keep in mind that these real estate markets in the cities you're taking about are not your average markets being priced off local jobs, wages, supply, demand, etc. They are totally distorted markets. You've got land protections. Then you've got laundered money from China/Russia, etc. floating about everywhere. Mexicans pooling money with multiple family members to buy houses they couldn't normally afford. Hedge Funds like BlackRock buying everything up.....just because they can. Non functioning interest rate environment. It's a fools game to be an average person looking for that first house in these places.