My mom had vascular dementia for 9 years before she passed away, hit me a few times (once with a cast iron cooking spoon), and I never raised a finger to touch her. So, based on that, I think I wouldn't, no.

The fact that you won't just say you wouldn't hit an old lady for any reason, any more than you won't just say you wouldn't hit a child for any reason, makes me very tired and done with you.