Suppose a new user posts a question. You know that the answer can be easily answered if they just look it up (for the sake of argument, that's the only problem with the question). So you leave a downvote and a comment about how bad their question is and they should look over at Resource X. Awesome, yes, you're defending against bad questions. Except now that user still doesn't know the answer, and they feel bad.

You've already downvoted their question. And there's a pretty fine line between a helpful comment, and a "-1 because" comment.

It's not really hard to work "you can check out this resource for more information on anything else you might ever want to know about this game" into an answer. So I say, why not do that instead of just leaving that resource in a comment and sending the user on their way to find the answer on their own?

tl;dr: If you can easily answer a question, then I say, do it.