Update #2 (Sept. 20; 5:43 p.m. EDT): A former student of Prof. Guth's, who says he's a conservative and NRA member, emailed me to object to my characterization of his former instructor. See below the page break for his email, which he assented for me to publish, with his name redacted.
An unrepentant David Guth doubled down on his hateful tweets wishing death and damnation on NRA members and their children, Katherine Timpf of Campus Reform reported this afternoon.* "#NavyYardShooting The blood is on the hands of the #NRA. Next time, let it be YOUR sons and daughters. Shame on you. May God damn you," the Kansas University journalism professor tweeted on Monday afternoon.
Responding to Campus Reform, Guth refused to recant. "Hell no, hell no, I do not regret that Tweet.... I don't take it back one bit," Timpf quoted him as saying. For now, at least, Kansas University is standing by Guth (Twitter handle: @DWGuth):