It's important that he lives by a code

https://startrek.website/post/2086733

It's important that he lives by a code - Star Trek: Website

Also it’s kinda stupid because it’s only true if you stop at the first killer.
No no, if you kill two killers you become a double killer and the count stays the same.
So by your logic… Would you become a triple killer by killing a double killer? Or a serial killer by killing a single serial killer? What about the trolley problem if the single guy is a serial killer then? I need answers

Due to the transitive property of murder, you have valid points.

But you always let the trolley kill the old person instead of the murderer; the murderer can stop murdering, the old person can only be stopped by killing them. In all other cases the murderer gets trolley’d.