I have learned in my life that the more I just tell people the answer the fewer opportunities they have for learning. Much of my knowledge comes from personal exploration and knowing when I need to ask for help and I’ve decided that I need to allow others to do that, too, and if I don’t I’m just taking that from them.
In this case they’d probably get a “you sure about that?” and that’d be the end of it. They’re only going to hurt themselves, it’s not like they’ll get anywhere far, so this is a great chance for some learning.