Most Helpful Guy
Only for revenge!1
Most Helpful Girl
If they threatened someone I loved.0
For having fun / for taking revenge
Dunno. Only thing I can think of - even if it is childish, but can happen in the heat of a moment - is if you are really emotionally involved with someone and they hurt you.
In the words of John Rambo "they drew first blood"
If they hurt me, then of course I would hurt them.
If they hurt me I'd intentionally hurt them so they have an idea of what it feels like to be hurt