That would be mostly smart of them, though the way Boss encounters are you won't necessarily want companions - there's alot of actual mechanics to deal with that AI doesn't generally handle, though my group DID kill the Hammer Station final boss with my Companion out after the Sith Marauder we had with us d/c'd(I was tanking as Juggernaught) and it went much better between that and realizing how his mechanics worked ;x

Also MiRai, fair enough, lol, but it's pretty vicious in other games even outside of pvp - usually it's just pvp they get pissy about, but I've had a handful not too long ago that were mad just because I'd have multiple high lvl chars in "one run" instead of doing it one by one...lol