I don't think the slope is as slippery as you are lead to believe.
You're not wrong, however, not every hockey injury should be simply lumped in with head injuries. Is a groin, hip, shoulder injury the same? Not even close. If you can take steps to reduce hits that can obviously lead to direct contact to the head, even if it's unavoidable, it's probably best to do it.
It's not like you're taking all the physicality out of the game. It's purpose, at its' most basic interpretation and use is to simply separate a man from the puck. Do we need huge hits to do so? No. Do huge hits add to the entertainment value? Absolutely, they're fantastic. However, when a hit in which the principle point of contact is the head, can be deemed legal because due to the circumstances of the hit it was "unavoidable", there is something wrong.
In the situation you propose, would it not be just as effective to allow angles to come into play and step up in that fashion? I'd argue it's more effective.
In response to your last post:
A defence and job is not to hit an unsuspecting player, at that point you suggest, it's to prevent zone entries, which can stll be done just as effectively so they're not going to lose a Stanley Cup over it. To place the entirety of the blame on an unsuspecting player is just as ludicrous.
Would you put the blame on a murder victim because they chose to walk through a dark alley, thus putting themselves in a vulnerable spot? Would a player facing the boards for 20 seconds deserve to get run because he put himself in that position?
That's a pretty regressive point of view to have on an issue as progressive as head injuries have been in terms of knowledge, no? If you truly hate seeing guys hurt would it not be best to do something about it?
I think the minute we view attempts to limit head injuries as bastardizing the game the battle has been lost.
They're not something to take lightly.
Not looking to get into a heated debate, just a healthy conversation.