DMR, for good or for evil, is here to stay.
Personally, I don't think interfering with people's communications, whether legal or illegal (not up to you to decide, but for a judge), is a sound tactic either; two wrongs don't make it right. If someone is using DMR and its bothering you to the point of turning your face purple, then by all means, head out to the FCC online complaint website and file away, but by interfering with someone's communications you're also breaking the law.
As for the DMR stuff, I've personally played around with it and I have to admit, its like the dark side of the force... it lures you... wide FM only sounds better when you have an amazing setup, but with a crappier setup you still get crystal clear audio until pretty much the end of the reception, then having the option to call groups, or individuals, send SMS, have 2 talkpaths on a single channel, or the option to do single-frequency repeaters...etc... the power of the dark side is strong... very strong....
I wouldn't mind a revision to the rules, but in the meantime, FM is what we have, now, if we like DMR that much, we should collect enough signatures from licensed operators to get the FCC to revise the laws and pass new ones that allows DMR/MotoTRBO on GMRS.