Why do you look so grim?

What is the deal with all these profile pictures of men who look like they are about to BITE someone? I’m fine with one or two unsmiling pix if they show something else about you, like your dog, grandkids, a hobby, whatever. But it’s pretty much a dealbreaker for me if you look like you’d rather square up than hug me. Maybe I‘m just a sucker for a nice smile, but, geez!

Thoughts? Esp. from you scowling men?