(Please Read, i need a solution) Player Attack entity instead of Entity Attacked

Why there is no trigger like: Player Attack Entity or Player Kill entity, it would help much more than using Entity Attacked trigger with player as Source Entity that work 20% of the time... And also why does Players Variables not work with that, I have a variable that shows TP of player(Training Points), I tried to do this:

When Entity Attacked

If Source Entity = Player
   set TP to (TP+5)

... it didn’t work, then I replaced Source entity with Entity/Target, to see if it works, it work but only when the player is attacked, not when he attack.

(It might look like I’m mad, and I’m sorry about that, cuz I’m not)