5. To the extent that a person places political correctness before truth, that person is not behaving as a scientist.
6. i strongly doubt that's what the people who downvoted me had in mind. I could imagine getting a few downvotes on those grounds, but not net downvotes.
Regarding 5, I don't see how not burning a particular book is a necessary condition for valuing truth above political correctness. "Destroying information" and "Valuing truth" might seem logically equivalent to you, but to me they seem quite in tension.
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.