I don't think Cacti's posts have gotten to the point of being completely unintelligible, but if it turns out he is just an alt trolling people, then yeah, ban that sucker.
The posts in the OP seem to be the worst offenders out of a list of not as bad posts.
I don't know, maybe I just have a high tolerance for stupidity and you should take my words with a grain of salt.
No opinion on Mr. Bones or Trymos' private investigating, I have nothing to add and putting my opinion in where it isn't as necessary would probably just piss in someone's cornflakes.