The tragic bit in the OP is not that some drug cartel middle-management got head-chopped, but that it is occurring on our soil.
Criminals will always kill other criminals in large numbers, but when they spill out of the cesspool in which they swim to mess up and stink up respectable folks & their domains, it merits notice.
Also, if it is natural and right to have sympathy & sorrow for someone good an innocent who is murdered, is it not also natural to express some satisfaction when someone evil and corrupt gets theirs?
Besides, I thought all this head-chopping was unpossible on American soil, that we could have an open border and the crime and human effluvia would stay on the southern side fo the border.