“Unalive” is a fun word
It’s a fun word. It’s used to get around censorship which is based as hell. It’s a tongue in cheek sort of thing. It’s like in Gravity Falls when Bill Cypher said “I have some children I need to make into corpses.” Obviously censorship is bad but it’s just so fun (as long as you can still say “killed” or “murdered” too if it’s actually serious)