Why hasn't someone speculated that it's a symptom of the mess that has been made of our country?.
There are few jobs, we're flooded with immigrants, legal and illegal, prices are way up, the government is in open rebellion against the populace. The international situation is in chaos.
Is it any wonder that the people are acting like rabid animals?
I've seen speculations of that sort discussed online. You'll never see such a thing mentioned by the media, though - too hard to spin it to the Commies' benefit.