I hope you are wrong. For one guy to be doing this in the manner it has been done, it would have to be a "Mack Bolan" type, and if that is the case, we are screwed, unless we go to martial law & suspend the constitution.
Of course, MB would be using a .460 Weatherby & be shooting mob guys.
I'm not saying it's one guy. I'm saying that given what has been released to the public we don't know how many killers are involved.