Michael had killed all his enemies, he could have kept Fredo on the mall. I still believe there was no need to kill him.

But for Michael, this was the only option. In his mind, he could not afford any more mishaps by his weak, stupid brother. \:\/

-In my HOME!!! In my BEDROOM WHERE MY WIFE SLEEPS!! Where my children come and play with their toys. In my home.

-My father taught me many things here -- he taught me in this room. He taught me -- keep your friends close, but your enemies closer.