I am old enough to have actually been involved with FidoNet when all of this was going down, and at the time Katz pretty much had the community believing that he was a little guy being unfairly squashed by the huge corporate behemoth of System Enhancement Associates for making a better version of their software. Pretty much every single bit of that turned out, indeed, to be a lie. Katz did steal SEA's work and claimed otherwise, and SEA was smaller than PKWare.

I get where you're coming from, but Katz basically stole Henderson's work, lied about it, and destroyed Henderson's business and, for many years, his reputation. I don't think I can really blame him for not having been terribly diplomatic about the man's death.