As an example arguments used by pro-gun advocates are marked as false. Here's a specific example:
They falsify a claim that doctors kill more people than guns https://www.snopes.com/fact-check/doctors-kill-more-people-t...
Yet this article linked on hacker news article states that medical error is the third biggest cause of death in the USA. https://news.ycombinator.com/item?id=11627213
I used to have many more examples, but the reality is that the facts that they "objectively" check aren't necessarily unbiased.