U of M has a whole website mapping racial covenants[0] here in the Twin Cities, and the Wikipedia article about redlining[1] is pretty thorough, discussing exactly what you're bringing up.

Do people just not actually believe how racist everything used to be? And how decades of disinvestment leading to violence just might possibly lead to generational issues?

[0] https://mappingprejudice.umn.edu

[1] https://en.wikipedia.org/wiki/Redlining

That still does not make the people who chose to leave responsible for violence that developed only after they have left!

Are you happy being held responsible for the development (or lack thereof) of the place you last lived in?

I think it's fair to say that race caused the riots, but to say that racism caused people to move is just silly. I don't care if black or white people are setting fire in my neighborhood, if I can move somewhere safer, I will.

I don't think that makes sense in context of GPs argument, as GP also argues that "more policing" did not help alleviate the violence problem.

The assertions "police were defunded, therefor the area got more violent" and "policing was escalated, and still the area got more violent" cannot both be true at the same time.