I'm sorry I have to disagree with you. You see, I'm originally from Rio which, if you know anything about geography and social studies at all, has a terrible problem with Drug Lords. Terrible. Escalation has been the smallest of our problems in the past 20 or so years. Drugdealers in slums here have had access to armor-piercing rounds, assault rifles, sub-machine guns and grenades for the better part of a decade, and still, they carried those ostensively in the slums to repress the population, but seldom used them. Even when confronting the police, you simply woulnd't see a grenade being tossed against them. Them, a while back, the authorities decided they had enough (there were other things involved, but just to give the short version) and sent the marines and the army up the slums alongside the Police's Elite Squad, to smoke out the druglords once and for all. It took 2 days, and the slums were clear. They didn't kill them, they arrested a ton of people, but they did respond with deadly force whenever they were met with resistance (and resistance in this clase includev molotovs, blunt-weapon assaults or gunshots, you name it) and they DID kill some people (wounded a lot more, though it's fair game in my opinion if it makes you not kill them). You mgiht say "It's not the same", to which I'll point out my previous arguments, lighting cars on fire is a crime. A severe, violent crime that exposes a whole heaping lot of people to the dangers inherent, not just the jackasses that did it. So no, it's not the same, but also not that different situation-wise. You had a mob perpetrating crimes abusing their sheer numbers, thinking it was ok to go around stealing, vandalizing and exposing regular law-abiding citizens to dangerous situations, this does allow use of lethal force in response, to help protect those people.
And it wouldn't make it Syria or anything.