Fact check
Bit of fact checking, or perspective as you may like...
* The crew was late because their inbound flight was late, the gate never bothered to pass that small detail on (they knew);
* Only a few pax booed, the rest shut up;
* Only two crew members (don't know CC or FD) decided to walk, the rest went along for solidarity;
* It was a MIA - NYC flight, for many, enough said. If you're not in the know, imagine your worst pax, filling half the seats, every day, on every flight between MIA and NYC. Flown it many times (as SLF thank god). If I were CC, can't think of a number high enough that'd make me want to work a flight like that. Crew agree so it goes very junior very often, meaning short fuse, less patience, no diplomatic skills...
Not trying to excuse anyone, but...
* Gate should have done appropriate announcement;
* Cattle should have shut up;
* Someone (gate, crew ?) should have called police to round up booeing cattle;
* Flight should not have been canx'd.
Basically, an all around fiasco, but bad pax behavior is definitively the root of this evil.
As for luggage going to LGA instead of JFK, I say lucky them, I would have sent them to ANC but that's just me.