This question asks if an own-goal counts for a hat trick. It originally was tagged football, although that was edited out. And in association football, the answer is basically, "mostly not" because a hat trick is not an official statistic. But in other sports, the answer is different. For example, in hockey, the answer is a clear no. Both hat tricks and goals are official statistics and an own-goal is not a goal for the defending player.
It seems that there should be a policy. If the policy is that cross-sport questions are allowed, then either an answer should have to cover every sport, or answers for any sport should be allowed. If answers have to cover every sport, then every answer to that question is defective. One is only for association football. The other two are probably describing a specific sport, but we don't know which, as they don't say or give references.
Personally, I would consider an "any sport" question where the rules of the sport matter to be overly broad. I think that the correct response would be to restore the original tag. Then people who answer would know that answers are expected to reflect association football rules and can be held to that standard. As is, my answer with citations was downvoted for being hockey-specific. Why aren't all the other answers downvoted with the same comment for being association football specific (or so vague that it's not clear)?
Either the behavior is the same across all sports (presumably the claim of the person who removed the original tag), or it isn't. If it isn't, then without a specific sport, it's too broad. If it is, then an answer from any sport should do, because all the other sports will follow the same pattern.
Please remember, that for some of us, association football is that sport played in high school that other countries (without the benefits of professional gridiron football, baseball, or basketball) play professionally (the US has pro soccer, but it's a minor sport, well behind the NHL). It's not obvious to someone like me that a hat trick is used as a term in association football. But it's quite a common term in ice hockey with an official definition.
Really, I feel trapped right now. I answered a question in good faith that was missing what seemed obvious points to me. Now, if the question had been tagged football, I could see the response that I received. But since it wasn't, I still think that a hockey answer was perfectly legitimate. Certainly from my perspective, as legitimate as the association football specific answer. Which is, after all, wrong about ice hockey. Because it claims that a hat trick is not an official statistic, but in hockey, it most certainly is.
I shouldn't have to feel like I could step on a land mine with any answer. If that question is supposed to be association football specific, then it should be tagged correctly. Then if I accidentally made a hockey answer, at least I'd be able to think, "Oops, my bad." But as is, I feel like it's your bad, for downvoting my legitimate answer or for removing the football tag. Or both.
In my opinion, unless a statistic is truly sports-agnostic (e.g. winning percentage, although hockey has different rules for that too), all statistic questions should have to be tagged with a specific sport. Because the answers will rely on the specific definition of the statistic in the sport.