There are numerous accounts of Mexican Military Enlistedmen fighting for the cartels and coming across the border. The Mexican government can't fix it and they aren't doing anything to stop the problem either, so that makes them accountable for the actions of their military.
Were so tied up in a war against terrorism that we don't have the resources to declare war on Mexico like we should. It's nice to know that when were in need of troops to fight a real threat to our country our leadership has our national resources tied up in another two bit cesspool half a world away.
Meanwhile on our southern border, more and more Americans are injured, terrorized or dying.