I don't understand this insistence on extrajudicial executions; doesn't the U.S. have them too? Those are not part of the Salvadorean legal system, are they? It brings nothing to the discussion, and seems an attempt at pointing fingers at best. If you want to discuss vigilantism, you realize that's another thing?

In any case, I can't agree with anything you said. Obviously reducing murders by half will have very deep trickling positive effects on a society. And the Salvadoran Civil War was simply not due, even in part, to cracking down on gang crime.

I reiterate that, even though you may not like it, or may want to use softer methods, or may resent one for making this observation, repressive methods provably work at stopping violent crime. Unless you're a slippery slope afficionado, what this should tell you is not that you should declare martial law on Earth, but that violent crime is a provably solvable problem. Arguably, alongside with morals, it would be nice to also have the imagination and motivation to achieve such result.