I've seen it. The lunatic with his son that leans out the window and blows away the chief of police's son. That scumbag got everything that was coming to him. But that's one example. I know it happens. What I'm saying is that it's a statistical improbability.
How many warrant services have you done? How many times have you been shot at whilst performing them? How many has your department done? How many of the officers doing them have been shot at.
When I first became an officer, we had an officer who was shot point blank with a .45. He was the only officer who had a balistic vest at the time (second chance). Dave D. then drew his service revolver and empted it. I have been shot at several times and it isn't fun. I wear my vests religiously now. I don't have a balistic plate in it but I don't know if that would help with some of the weapons available.