Dismissing their violence is rude. They are capable and willing to do whatever. As evidenced here https://en.wikipedia.org/wiki/2011_San_Fernando_massacre

It's a much bigger problem that you all realize. Right now they have authorized attacks on border patrol agents...

I'm not saying that the US wouldn't retaliate, I'm saying our enemies are getting bolder under this administration's pressure. Turns out the closure was because of drones... But it's still a real issue in Mexico that Mexico would love the eradicate.