I can comment that DC has definitely suffered from increased violent crime, which has affected "normal" people not in the demographic covered by BehindBlueI's. It has spilled over into areas you'd previously go out to hang out at/get dinner if you were a normally employed professional who lives in the region.
The result is that it has killed "local" tourism....people from the suburbs don't drive into the city to do things as often as they did before. Car jacking in particular is through the roof. In general, I can go out to eat in Virginia without having to worry about a random gang shooting breaking out in the restaurant...the same cannot be said for inside DC...it has happened twice at venues I had personally eaten at within weeks of the respective incident.
This, alongside the "fair wage tax" (or whatever the fuck it's called) for restaurant staff has basically killed local tourism from the suburbs.
FWIW, I've actually liked DC as a city for the majority of my adult life. It's not like I'm anti-city. Additionally, I used to spend a lot of time in Philadelphia and loved it, but that turn for the worst happened well before the 2020 summer of love...around 2014 or 2015 or so, Philly got rid of its vagrancy laws which basically turned the previously nice sections into a petting zoo for the homeless. They did not mind their own business, unlike @
BehindBlueI's exemplary unhoused denizens.
Im not aware of Illegal aliens being a large source for increased trouble, though. I'm pretty Machiavellian when it comes to border control, but (elephant in the room alert) the problems in this area seem to be almost entirely stemming from black street gangs who are capitalizing on the de-policing movement within DC...which is also why you see a dramatic drop in their activity when you hit the Potomac river, where Virginia has not suffered nearly as much de-policing. We've got Hispanic gangs in Northern Virginia, but that's still tracking along the historical norms for who/what/where/when/why.