> I can't fix it, and apparently, I can't even fall back on people who should know better (those who compile dictionaries) for help, so why bother?

You're trying to solve it the wrong way. The word "regardless," however correct, has become outmoded by the new, flashier "irregardless." So rather than try to force people back to using the old word and be seen by millions as an old fashioned "stick in the mud" (am I old fashioned for using that phrase?), what you need to do is become a proponent of a new replacement: "disirregardless." It's fun to say, and it adds a third negation, thus reverting the meaning back to what it's supposed to mean.