We've experienced this where I am, and I agree. Mixed demographic high density is necessary to prevent the stigmatisation that comes from living in designated ghettos.
It does look like they're thinking about these things to sone degree though, thankfully:
40% of the units designated for tenants earning 30% of the Denver area’s median income.
I am very happy that there are efforts to help the homeless though. I hope it is to help, and not just hide away.
I'm personally a fan of Singapore's rules which make 5% of all new development social housing.