Excellent point by point summation. I will expand on the Devils point a bit.
In a weird way I forgive Devils fans, because their attacks are motivated by the fact that their team's very existence has always been somewhat marginal in New Jersey, even after three Cups, even after getting a brand new arena in Newark. The more successful the Rangers are, the more their team's very existence becomes more precarious. Heck, the whole reason the New Jersey Devils exist is that MSG management in the early 80s decided to stay at MSG after getting the City to cave and give them a perpetual property tax exception.
If the City refused to do that, its almost certain the Rangers and Knicks would have followed the Giants and Jets to East Rutherford. The Colorado Rockies were brought in to fill dates at the brand spanking Brendan Byrne Arena.
The Devils are about to enter a very interesting/potentially dangerous part of their history. The Marty Era is all but over. Lou has clearly lost a few MPH off his fastball. Their farm system is average. What's going to happen if they enter into a true rebuilding period for several seasons? How viable is the Prudential Center going to be with the Devils drawing 10k-12k a night (if lucky), no NBA tenant, and fierce competition on the concert circuit from Barclays?
Add in a competitive, likable Rangers team and who knows, maybe a competitive Islanders team in Brooklyn, and where does that leave the Devils?
Their rich cable contract will protect them from outright relocation, but could they enter into a period of some serious belt tightening? I could see it, yes.
So yeah, we are about to eat a lot of poo from Devils fans, no question about it. But its always helpful to remember the real motivation behind their trash talking.