The Stackexchange software which powers the SE.AI forum as well allows to upvote answers but the opposite is also available. Sometimes so called serial voting takes place. That means, that not a single posting receives negative perception but a handful of them. Unfurtunately, it's not possible to trace back the origin of the frequent clicks, perhaps it was a bot or it was a real user. Nobody cares.
The dominant reason why Wikipedia doesn't support upvotes of articles is because of that reason. The added value of a poll about information is low and my advice for Stackexchange is to deactivate the voting feature at all. Perhaps i can tell a story from my own blog. In the wordpress system there is also a polling feature available. Users can vote for an article and decide if the quality was poor or very good.