Okay how about you volunteer for sports science and stand in the middle of a field with a blindfold on and a helmet on and let james harrison bull charge with his helmet and drill you, and we can see the effects it has on your brain as well as possible spinal damage in certain situations.
Honestly... I'd love to see two teams come to a pact and just play flag out there because that is what the NFL wants on passing plays. I'd love to know what Dunta Robinson was supposed to do in that situation according to the NFL. Is he supposed to stay on his feet, allow DeSean to catch the ball and then tackle him? Is he supposed to not touch him at all? In that situation the only way that Robinson could stop a catch being made was to hit Jackson, in the air.
Harrison on Massaquoi is the same deal, if Massaquoi doesn't lower his head he doesn't get hit in the head and again, Harrison's job as a defender is to stop him catching the ball, again, should he stand, wait for him to catch it and then tackle? The whole defenseless receiver rule is a joke. A receiver makes a decision to go for the ball and try and catch it, if he is afraid of being hit, don't try and catch it.
I don't condone helmet to helmet hits like Merriweathers, there is no need for that but the NFL is supposed to be a contact sport and a heavy physical contact sport at that.
If you stop people being allowed to hit the body of receivers then all that is left is the legs and I can tell you that "tunnelling" someones legs out from under them in say the Jackson situation is every bit as likely to cause a concussion and/or neck injuries because you flip them and effectively whip them into the ground, actually further accelerating the impact. If Harrison has to dive at Massquoi's legs to chop him down as the only way to make him drop the ball you are going to get broken legs and destroyed knees, which will end a career far quicker than a concussion or two.
Basically the NFL's obsession with protecting the head will come at the expense of the legs if they continue this way as the only way to stop receivers from taking catches where you have no play at the ball will be to smash through legs to try and flip players and use the ground to create the impact or to break legs in order to inflict so much pain that they drop the ball.
The NFL is just being ridiculous, they changed the rules to create these situations and are now surprised that it has created collisions and want to try and blame someone else. I entirely stand by that having a "rules committee" does nothing but create stupid rushed rule changes, you are employing a whole bunch of people whose livelihood relies on making changes to the game, not making the game better or leaving it be but entirely on making changes.
It really is like a waiter situation, you tell them they are fired if you see them standing around and they will wipe tables that are already clean, in this situation the clean table was the NFL 10 years ago before all the rule changes that had to happen because otherwise you had to fire the waiter...