So you help destroy your neighbor's economic prosperity in manifold ways, then create a giant economic vacuum by outlawing products which they can easily and economically will produce.  It's totally predictable.  Action and consequence.

You see, some of us without our moral pretension would prefer to see all murder and carnage cease.  

Rather than create a false debate over the gang members being moral agents (when you don't even know if all of them were engaged in shooting, some of them could have been shot without being armed or firing) when I never said they weren't, you'd rather assume this is some sort of exception to a pattern that ultimately leads back to Mexico City and Washington.

Governments see patterns or at least create patterns.  I'd prefer ones that don't end in ignorance and murder. Whatever form. Your's or their's.

  because the drug trade is illegal. If drugs were legal criminals would not control the drug trade.

  Blaming drugs for this violence is misguided. The opportunity to make large amounts of tax-free cash is created by the drug war. The meme that drugs somehow automatically cause violent, criminal behavior is one of the chief talking points of the anti-drug zealots whose tireless work keeps this farce going.

  Decriminalization would leave this situation unchanged. Drug trafficing would still be illegal, and all the problems that attend would still exist.