Whatever else is true, I think most people consider that anyone resorting to threats in any argument instantly loses any shred of credibility they had remaining.
I would agree with that, but to be fair, Jorge was being taunted like a nerd set upon by a pack of schoolyard bullies. No matter how reasonable and well-socialized and mature you may be, that sort of thing can elicit rash behaviour. It's not an environment of rational, respectful argument. It wasn't even worth the label "argument".
I've spoken rashly here under less oppressive circumstances than that.
Well yeah I get that... and I do sympathise. But it's not exactly his first day at the Internet.

Furthermore I appear to be included in the threat target group and I really don't think I'm guilty of conducting a concerted effort to direct any vitriol towards him - certainly never anything of a personal nature. I've just expressed my increasing disappointment and frustration about his rather disingenuous 'technique', which is to present an agenda-driven opinion as if it were based on facts and objective research - not to mention consistently and consciously recycling already debunked arguments.
I too would prefer that all the people he antagonises would show some respect and civility - but throwing your toys out of the pram and threatening to 'teach people a serious and unforgettable lesson with just a few keystrokes' sounds like something an angry teenage script kiddy might say; not an academic of his years and experience.