"Why do we kill people who kill people, to show that killing people is wrong?"

Probably for the same reason that we arrest kidnappers and hold them against their will in prison.

"Satan's a Republican"

When you can't make your argument logically, demonize the opposition.

"The only Bush I trust is my own"

A doubtful proposition. If this is the sum of your political thought, you probably should not be trusted to vote nor handle sharp objects nor possess shoelaces.