Well, I can't speak for anyone else, but:

Having incorrect beliefs ... is the right thing to do.

This raises immediate concerns, and that's just in the first sentence.

Your beliefs have to be judged by your other beliefs because pure objectivity is epistemically inaccessible.

Incorrect. If I believe that an apple will fall if I drop it, I can test this emperically by dropping an apple. I can judge many beliefs based on results, not on other beliefs.

Those seem to be the most blatant reasons to me.