Either way, it sounds like you have a very low opionion of the search for justice in society.
Alternatively they could be saying all the resources put towards catching murderers since the number of those they murdered are relatively few.
To be clear I'm strongly against the death penalty. OPs comment seemed to trivialize the deaths that happen as a cause of murderers or the actual killing of those murderers and I have an issue with that framing. I think putting resources towards understanding these things are resources well spent since they directly impact what society decides is justice.
Now you have just exposed the risk of them existing in this planet and doing more harm. Not to mention say 40 * $50,000 or $2 Million spent on keeping them alive
https://www.who.int/data/gho/data/themes/topics/topic-detail...
We spend a disproportionate amount of time/resources on the 10 deaths of people who have actually committed violent crimes.
FSD, Accelerating cures via AI, safety automation all save 10,000x more innocent deaths. But reams of books/articles/philosophy/debates around capital punishment compared to accelerating technology.
Sad state of humanity