Ok, this is going to sound incredibly callous but...so what? Yes, a couple of people were killed. How many people were killed yesterday, in just one day, in DC, Detroit, LA, New York...???
Gangs routinely kill each other, innocent bystanders, and the direct victims of their crimes. They are not so "difficult for law enforcement to detect" because they hang out together, wear "colors" have gang tattoos, etc.
I don't buy into this "detect first" argument at all. First, it is just plain useless - even when law enforcement has a pretty good idea exactly who is going to commit murder, they cannot prevent it. Second, it would be illegal anyway. You cannot arrest someone for thinking about a crime. You can only arrest someone for actually committing a crime. We do not have thought police - yet.
Getting back to the numbers, and being callous. A couple of people are dead, yes, and that is a tragedy for their families and friends. But in the larger scheme of things, given the number of people routinely killed in traffic accidents and/or by other more prominent criminal activity... Is this even worth talking about let alone going after? Of course not. It is yet another example of liberal smoke-screen and emotional blackmail. This is not even close to a "significant domestic terrorism threat" when you stack it up against drunk drivers, gangs, or illegal aliens.
....I predict a "Thought Crime Czar"......