@talk72000,
By "Dutch guy when he ran for office" do you mean Theo van Gogh, the film maker who was murdered by a muslim who didn't like his critical film Submission?
I don't think that was the result of a fatwa. It was a privately motivated fanatic who was judged criminally insane.
As for arresting and deporting people who carry out fatwas ... what do you think the countries concerned are doing? They don't just let people murder each other.