Hmmm... Disloyal rogues seem to be the biggest offender.
To me, there is an element of poor roleplaying in this that is akin to the neutral/unaligned character switching allegiances on a whim because "neutral characters are unpredictable.". No, neutral characters are unmotivated by higher virtues. That doesn't mean they don't make friends or are incapable of any sort of attachment to other people. Same goes for rogues. Watch any movie about the mafia. The characters are usually morally challenged, but still have the ability to show loyalty to their comrades and care for their friends.