It just always seemed silly to me that those crazy Night's Watch guys would kill Jon while they're surrounded by Wildlings, and Jon is pretty much the only one keeping the Watch-Wildling truce together.
Yea iirc in that chapter Jon looks around and sees them fighting one of the giants right before he gets stabbed...don't think that would go down too well considering its a fucking giant already inside their walls not to mention the wildlings outnumber them by a ton.