Would you assume some of us would?
I would certainly hope that your question isn't implying that people opposed to the Iraq actions or to President Bush would find some justification for cold-blooded killing by any group. Seeing motivation for anger and hatred is a completely different thing than seeing motivation for brutishness and bloodlust.
Killing and torturing hostages, no matter what the political motivation, is simply wrong and inhuman. My heart goes out to the families of all the innocents killed as this man was.