As Interceptor said and others have alluded to, intent really must be scrutinized in order to even try to equate what Judas did and the Captain did.
Judas' intent was spite and retribution. He is playing for the team who eliminated the Celtics two years in a row for less money. Allen is NOT an "if you can't beat'em, join'em" kinda guy. He's too competitive, I'll give him that.....However, he chose to play for a team that has hurt and can again hurt the Celtics' chances for 18 because his pride was hurt and he felt unloved....boohoohoo....his direct intent is to hurt the Cs chances for 18.
I am having a hard time 1. seeing why people can't see this clearly and 2. if they do see it, how they can remain apologists for Allen and still root for the Cs.
Allen also banked on his New England popularity to quell or minimize the amount of flak he would take from the fans, and he misjudged that badly, which is what prompted his disingenuous "Thank You?" (It should have said "blank you") advertisement in the Globe. Nice try Judas.
Whatever Paul Pierce's intent was (and threatening to come out and demand a trade and doing it are not even close to being the same thing), it wasn't to spite the Celtics organization and fans out of vindictiveness. That is what Judas did.
Allen had the mens rea, PP did not.