Because Jesus Christ taught us to "Go ye into all the world, and preach
the gospel to every creature." Mark 16:15. He didn't say anything about
killing people or about starting wars. Jesus Christ taught us to "Love
your enemies, bless them that curse you, do good to them that hate you,
and pray for them which despitefully use you, and persecute you."
Matthew 5:44. Jesus Christ also taught us to "Judge not, that ye be not
judged." Matthew 7:1. The Bible also says in James 2:13 "For he shall
have judgment without mercy, that hath shewed no mercy."
I think a real Christian would not have turned Saddam Hussein, or more
likely one of Saddam Hussein's look alikes, over to be executed after a
kangaroo court found him guilty. Jesus Christ also taught us "Therefore
all things whatsoever ye would that men should do to you, do ye even so
to them: for this is the law and the prophets." If George W. Bush would
ever get into a position where he was captured by a hostile government
no doubt he would want mercy shown to him. Mr. Bush, Jesus Christ also
taught us "Except ye repent, ye shall all likewise perish." Luke 13:3.
If you want to do that, here's a link to a tract that will help you get
started:
http://www.chick.com/reading/tracts/1014/1014_01.asp