This isn't my argument. This is the argument of many people who think the murder is justified, including the parent comment which implied this is a simple 1 person vs 10,000 people trolley problem.

I am pointing out how silly that line of thinking is.

With this line of reasoning, the french revolution was about the stipend of the King.

Have you ever seen The Dark Knight? There's this quote about sending a message.

Gotcha, so 10k lives weren't actually saved, but a "message" was sent.

Cool.

Makes perfect sense to justify killing people on the sidewalk in real life by quoting philosophy from the Joker. That’s the sign of a strong and correct moral foundation.