Should police be allowed to just round up and kill all gang members in one mive sweep?

I don't mean the little babysh*t "tagger crews", I mean the serious organized street gangs who operate inside and outside of our prison system. Instead of bullsh*tting around and arresting them, letting them out to commit another crime, having them threaten witnesses or victims from behind bars and using their "homies" to strong arm other people into fear, why not just round them all up and take care of them in m executions? Hell, you can even have a secret police force that goes around, gets them off the streets, takes them to an undisclosed location and just shoots them in the head and buries them. Problem solved. Why do we act like pu$$ies in this country and let these little punks intimidate the average people with their nonsense? There are places that cops can't go because the gangs have them outgunned and that is some bullsh*t. Our cops need rocket launchers and machine guns and should be allowed to just macre any and all gang members. If ammo is too expensive, they can always just use bowie knives and axes once they have rounded up a good number of them. If an entire family happens to be gang involved, oh well. Better to deal with them young than have them grow up to be a pain in the a$$ in the future right? Why can't we have mive exterminations of gangs? You think that most law enforcement would be opposed to this idea or would they be the first ones to sign up for the "Gang Extermination Unit"?