Oh pooh.
His ISP has all of that info.
Not if the coward ran a sophisticated level of proxies.
His ISP will have info on the sites he's visited, which may lead to his postings. Any raving writings that he made personally--like a diary--may not be online, though.
The LE has been very very stingy with info. Then they leaked a little to NBC, a favored media of the prog left.
Now they act like they can't crack a problem like this?
I don't care how tinfoil it sounds. The info that comes out is either mismanaged, or suggests political management of an agenda-driven narrative.