Answer:
I suck.
I am a rock group that has 4 members, all of whom are dead, one of which was assassinated. What am I?
Before I grow I'm small. When I'm old I grow tall. When I die I give a mighty fall.
When you are inside me you will be encouraged to slam other cars.
In many hall ways you would stand if not with me in hand.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.