Downvoting this comment without offering a counterpoint is very bad etiquette. Can someone provide a counterargument? Otherwise it's just pretty much censorship.
I do not think "censorship" means what you think it means. Censorship would be moderators deleting something. Making claims without citations is fully in play to downvote.
I guess you're right about the censorship part, but still, just downvoting comments without replying is not useful to anyone. The comments above that reply clarifying the situation are much more informative.