Should they stop taking away batters helmets in baseball so pitchers stop pitching up and in?
In this situation, the pitcher is the person in control of the contact; but he will
never be hurt by his own mistake that results in the ball bouncing off someone else's head.
(He may of course be hurt by the batter and all his very good friends when they charge the mound, but that's a seperate kettle of fish...)
Should the take away all of the safety advancements in auto racing so the NASCAR drivers stop bumping eachother?
No racing driver can ever consider himself in complete control of a situation. A driver can put in an hour of trouble-free racing and then, through no fault of his own, have a mechanical failure on his car, or get caught up in someone else's accident, and suffer fatal injury.
The football player making a tackle compares to neither of them; he should have complete control over his tackling form, and if he were to tackle head-first without a helmet, there would be immediate pain
for him as a result of that mistake, which would provide a very pressing incentive not to tackle like that again.