Two wrongs don't make a right, ( but to lefts do... )
That applies to both sides here.
It is not acceptable to ME to exploit the invis bug, plot craft exploit, or even resell novians.
It is also, not acceptable for ME to lust after the things the banned players got from exploiting nor any of their plots.
Just because a player seems nice in MP and crafts for tips, but also exploits bugs and harasses players at spawn points doesn't make them good for the game or absolve them from being banable.
Neither is it right to think just because a player can be rude or cranky, they are automatically band for the game ans should be banned.
The entire scope of a players ACTIONS are what define a their reputation in the game. If enough unacceptable conduct takes place, no amount of "niceness" will undo the damage.