Further, I'd like to see some factual, scientific statistical analysis done to prove that tip tackles are indeed hugely dangerous (obviously they are very dangerous – I’m sure we’ve all heard of someone jumping into the shallow end of the pool) and how much so compared to scrums. In all my 26 years of life I have never seen anyone injured from a tip/spear tackle, however I've seen many injuries - some so severe they were career ending - from scrums (again obviously there are many more scrums).
First of all, welcome aboard.
I know 26 seems a lot, but some of us are bordering on being Old Geezers, and a few are King Geezers! I have seen a very serious, and career ending injury from just such a tackle. I don't have a scientific article to post, but from my perspective, once a player is upended, the outcome is very hard to control, hence my previous posts about the end result (injury or not, landing on head / neck / shoulder or not) is not the point. It is inherently dangerous.
Scrums have been, and will always be a thorny issue. At this level, with professional training, the scrum is actually much better controlled, although many of us might prefer to see the power hit modified at least. But if you look at the rate of injuries per scrum, especially at elite level, it is very low (and as you say, there are so many more of them). It is also an integral part of the game, dropping someone on their head isn't.
Look forward to more posts.
Cheers
Edit - don't mind Bullrush, he's a Kiwi!!