In all seriousness it's a good point.
We had the same thing with tip tackles, if you tackle the way you're taught as the correct technique when you're a kid, it doesn't happen.
You're perfectly capable of tackling people without being any danger of the head........ Although
My new tactic is to 'fall over' and headbutt the shoulder, tackler is at fault for accidental contact with the head, possible yellow certain penalty.
I don't know why I put fall over in inverted commas, I spent 25 years as a prop falling over from exhaustion in attempted maori sidesteps with ball in hand, just cos I know pretend to be a back doesn't mean that's changed!