I just came across this question (EDIT and this one too!). It would have been nice to be able to downvote it.
The post downvote button has been disabled in this sub for a few years.
If the moderators judge that a question follows the rules here, it's permitted to stay, and open for people to answer. Whether other readers dislike the question, disagree with it, are tired of it, or whatever, isn't the point: OPs come here to ask questions about history, and should not be punished for other users' opinions.
Here are some meta posts on the topic:
announcement https://www.reddit.com/r/AskHistorians/comments/177gbp/meta_from_today_the_downvote_button_will_be/
post-implemenation discussion https://www.reddit.com/r/AskHistorians/comments/1bvdwo/meta_do_you_think_this_subreddit_would_improve_if/
pre-implementation background https://www.reddit.com/r/AskHistorians/comments/15orr4/meta_a_reminder_to_all_about_downvotes_and/