Presently, Portland is in a state of failure and no federal action is being made to reverse the issue.
The same can be said for others that are beyond help but not t the degree of Portland.
The example to refute your argument is Baltimore. Baltimore died and there was no federal salvation
Baltimore has been getting billions in federal aid annually: re: https://foxbaltimore.com/news/local/baltimore-city-gets-billions-in-federal-aid-annually
In addition Baltimore gets state (MD) aid to the tune of $1.4 billion per 2023. re: https://dls.maryland.gov/pubs/prod/NoPblTabPDF/State-Aid-to-Baltimore-City.pdf
Cities should stand or fall on their own. I.e., with money that comes from their tax base. Federal and state "benefits" mask the graft, corruption and fecklessness that comes with free money.