I'm not quite sure how you conclude that.

Simply by being factually and provably wrong in so many of your posts, and ignoring even well-intentioned attempts to correct you, you have destroyed all trust in your competence and good intentions. Finding plenty of examples in your posting history is an easy task.

I'm disgusted and embarrassed about the entire lot of you.

Oh please. The negative responses you get are not evidence that this community is somehow bad or particularly negative, in fact it's a testament to how open it is that you haven't been banned and that you still get plenty of well-measured responses, despite your continued abuse of this community for whatever campaign you think you're running. You bring the negativity upon yourself, no matter how hard you try to ignore your guilt.

How do you, in good conscience, actually say that, in such a public place, taking pains to call-out the individual by name?

For the same reason that criminal records and sex offender registries exist: to protect the innocent from you.