I'm not in favor of head shooting deer either, and I think I've shot more than 10 deer in my life... lol
From my range days, dealing with the public, I'd say more than 99% of the hunters out there, couldn't "reliable" hit a deer in the head every shot under field conditions at 100 yards, maybe not even 50 yards.
My dad was the greatest game shot I've ever seen, and even he wasn't a fan of head shots...
DM