There were only five comments to my answer below.
I would like to know why only my comment to @J.R. was deleted. It was neither rude nor offensive and it was even upvoted.
Was it automatically deleted because it was flagged by multiple users? If so, I think this feature should be changed or cancelled because (1) it might have been flagged maliciously or (2) it's not something new on ELU that there are multiple users who use multiple accounts to vote each other. Even if they get caught, the punishment seems to be too weak.
I'd like to know whether it was deleted by (1) a moderator or (2) multiple flags automatically. If the answer is No. (1), I'd appreciate explanation from one of the moderators. If it is No. (2), I will raise another issue.