To put it simple, my principle on comments is not do delete any comment as long as it is legal, not spam and is readable, and (this one is important) it is NOT personal attack.
I don’t like flaming comments that judges someone else’s personality, generalize them to people from a country, with certain religions belief, or simply the language they use. I do remove these comments.
Just be back from the trip, and it is about 10 days’ comments I didn’t reply. Let me take some time to clear these backlogs.
Again, thanks for commenting.