I doubt the purpose here is so much to prevent someone from intentionally side stepping the block. It's more likely here to avoid the sort of headlines you would expect to see if someone was suggested "I wish ${politician} would die" as a response to an email mentioning that politician. In general you should view these sorts of broad word filters as looking to short circuit the "think of the children" reactions to Tiny Tim's phone suggesting not that God should "bless us, every one", but that God should "kill us, every one". A dumb filter like this is more than enough for that sort of thing.