Killing yourself at 0.5 does make sense when you're holding a tower, right now you can keep away Pkers with that and or respawn faster to reach the flag room with full life.
Anyway, if I lead someone to kill theirself I killed them, if I didn't hit them they wouldn't have killed theirself. CS:GO, CoD, LoL, Fortnite and like way more games have the same feature, if you want to say this makes no sense you should talk to the huge companies and explain them.