Baltimore may be the current worst example, but it is not unique. New York City and San Francisco and LA are all filthy. People think nothing of dumping their trash anywhere.
Over the past month, maybe because of a new mayor in town, I've noticed an increase in trash. More specifically, abandoned and stripped cars, left for days in same spot. Reminds me of New York City, just on a smaller scale.
Again, back to parents and children. Failure to teach respect, discipline, and all with regards to trash leads to filthy communities.
With all due respect, NYC hasn't been that way since the Dinkins Admin. Giuliani really cleaned up things (though his tactics may not have been perfectly civil libertarian) and Bloomberg (who was NOT my favorite mayor when I worked there) carried on that "quality of life" focus to the point where Brooklyn is now gentrified and borderline unaffordable. Even Harlem is pretty nice up to 125th Street.
To be fair, I have not to been to Baltimore in decades and my visits to NYC suggest that it is creeping very slightly backwards. And yea, there are pockets of hell in NYC and DeBlasio is incompetent... but dirt and municipal stupidity are in abundance pretty much anywhere.
But NYC is far from the place depicted in Death Wish and The Out-Of-Towners.