Rugby has it's own issues with concussions (as obviously you personally know). Some recent studies have shown that there's 4.6 catastrophic injuries per 100,000 players annually - compared to 1.0 per 100,000 in American Football. Rugby is an extremely violent sport and concussions are on the rise.
They are totally different sports and their chronic issues are different ie spine and neck injuries in Rugby are very prevalent.
I get that their technique of putting the head to the side and driving with the shoulder may be safer for the tackler - but they are most definitely trying to "blow up" guys.
In terms of tackling and keep in mind I didn't play Rugby - but IMO there's one big difference and that's the size of the players.