Would you give essential home maintenance advice to a neighor who has been a complete idiot tool??

I live in a small detached home, and live between two neighbors who are useless idiots. Both have seriously lowered the tone of the block, broken major bylaws and brought trouble onto the street. They have no standards, or follow no codes, of behavior And both seem to be completely clueless about how to properly maintain their homes.

Neighbor A has been a real nuisance, and is a complete crook. Also his sons work as contractors, so they should know something about home maintenance. I have absolutely no intention of saying anything to this neighbor. Neighbor B is just really dumb, has obviously never owned a home, or probably lived in an actual house before now. So, while he has been a pain in the neck i do kind of feel sorry for him and his wife and kids, because, if they do not step up and start maintaining their home, they will be faced with tens of thousands of dollars in repair bills, will not be able to pay, and will have to just sell the house as property and move into an apartment, or most likely move in with her long-suffering parents.

On the one hand Neighbor B has been a real pain. He is ghetto -- playing really loud music, tinkering with crap cars every second of his spare time, having all his friends (who live in public housing or basement apartments) over to work on their cars, going out to party instead of staying home and taking care of the house -- which is the main reason he is getting into this mess. On the other, when he and his wife realize that they are being nuisances they do stop what they are doing. It is just that they are not very smart, and their capacity to think is pretty limited, so it is always a case of their doing something wrong, then someone pointing out that they should not be doing this, and their stopping.

Neighbor B has had vermin issues, has only closed his crawlspace vents during the winter two years out of seven, has only weatherproofed his deck once, has done no point work on his foundation (there are major cracks, even holes, everywhere), has never checked under his large deck for issues, and did nothing to permanently repair an issue with the exterior wall of his extension. He also piles snow against his house, even against the section than needs repair. Finally, and most urgently, his roof needed replacing last year. The very cheap shingles put on more than ten years ago, are starting to decay, and even fall off the roof. So, the railings of his deck are starting to fall apart, the deck and front-porch stairs are uneven and rickety, etc., etc. The house, which started off looking much better than mine when we both moved in, just looks a disgrace., here is the question:

Would you go out of your way to give this guy some much-needed advice RE maintenance, like pointing out what should be very obvious ("Your shingles are blowing off in the March wind dude!"), or would you forget about it?

If the latter, why? Would it be because he is a pain, and deserves everything he gets? Because you would be rid of the guy sooner rather than later? Or, just because there is no point?