

He treated the situation as a civil war rather than a criminal matter. What do you do in war? You go after all enemy combatants, you don’t try to determine if one specific soldier killed any of yours. Anyone in enemy uniform is a legitimate target unless they surrender.
El Salvador gangs do have specific ways of visually distinguishing themselves even if those are not traditional uniforms. Of course there are people wearing the same clothes and tattoos just because they think it’s cool, but that is unfortunately a darwin award case.
In this context the captured are not in prison but in a POW camp. What he’s missing is an exit strategy. Eventually you have to establish a permanent peace and release the POWs under some conditions. Not to mention obey the Geneva Convention which enumerates some rights. That’s why he’s always framing it as being tough on criminals.
Eh, embracing the country where you live instead of the one you were born into for whatever reason is legit. Especially if you found your “true home” at a relatively young age.