Here is a question which deviates makes an assertion which is not true regarding both Buddhism and its History. What is the best cause of action to take in such an instance.
Ideally we should try to point the person and would be readers to the right direction and try to attach them to the Noble Path. So the action needs to be motivational than just up and down voting as this does not give such incentive, guidance or direction. This does not by all means imply we should not use this as a tool to keep the site quality up, but make this and opportunity to cultivate the quality of 'Anuththaro Purisa Dhamma Sarathi' and Skills in Questions.