His mama didn't give him this name. He is a convert. Converts in any religion tend to be the most zealous for the Religion. The Koran says it is necessary to fight against and kill infidels. Radee failed in one aspect. He did not die killing infidels. His ticket to Paradise did not get punched.
He had a pretty violent past. He was sentenced for over 20 years and all but 2 years were suspended. Had they kept him, this would not have happened. He should have had a lengthy probation because he later got threatening at another workplace and that would have put him away