It’s mostly a drug problem. If you don’t deal with the drug issue first, putting them in public housing just moves the problem to the public housing. See the last 20% of the video at the link above for a proposed solution that has a good track record.
A few years ago I did some site work on a new upscale apartment complex in a nice suburb of Minneapolis.
I asked the manager why there were so many junk cars in the parking lot since the rent was very high and people like that usually drive nice stuff.
He said in order to get the project approved they had to give a percentage of the apartments to Section 8 people.
He was very annoyed about it.