They cause too much brain damage.
Zikachu
Cause his mom was in a jam. :(
Because nurses are taught in nursing school to always look for her patient's best side.
The game where players make enough money to risk getting brain damage, or the debate where the players already have brain damage?
Because he made his rabbi a little cross.
You get banned from the petting zoo.
Because he couldn't pronounce Miss Philippines.
The players all drowned in spring training.