What qualifies you to evaluate him? Angry rants? I've flown with plenty of pilots over my career that have displayed angry rants. Over ex-wives, taxes, politics, seniority list integrations...you name it. Does that qualify them to check YES on item 18(M)?
I can name one regular poster here that was kicked off this forum for sending angry threatening PM's. He's back under a clever new screen name and has toned down his act slightly, but he is just as bad as you portray RES to be, if not worse.
Just as Luvthe9 does not work for USAirways, is not Courtney Borman, and has friends in high places at APA, RES says he is not Mark C Doyal. I guess we'll never know for certain.