I will go with you up to #5. Beyond that, I’m not so sure, although I do know it happens of occassion.
I lived in a Section 8 neighborhood for 11 years and there was never any wholesale condemnation. In fact only one house was declared unfit for habitation but only after a fire, then it was repaired.
I’ve been out of there 5 years and it still exists, nothing has been razed and it was primarily a section 8 neighborhood for more than 10 years before I bought my house there, and I’ve been out of there 5 years.
I must be very fortunate in where I live . There is a Section 8 apartment complex about a mile away - I give a tenant there rides occasionally — have never seen any kind of problem in the area. Not saying there is no elgibility fraud — but no violence, obvious drug dealings, or any evidence of decay. Kids playing on the playground in a normal fashion. Quite a few units had nice Chrustmas decorations.