Absolutely disgraceful. Actions like this warrant the severe suspension, as well as legal action against them. A vicious blow to the head like that can cause life-altering damage and suffering and warrants legal action, regardless of whether it occurred during a match or not.
I take serious issue with that first challenge. There was minimal attempt to wrap, and if you slow the clip down to .25 speed you see Tuilagi's head come into direct contact with Dollmans head side on. The impact head to head could cause serious injury and is very dangerous. I understand the game happens at incredible speed and there may not have been malice intended, however, if World Rugby is trying to minimize head injuries, this is exactly the type of thing thing that needs closer monitoring.
What an absolute class act. He is the best example of what rugby is all about to me. Sharing tough moments with your team and opponents and being candid about it, showing full commitment, and being gracious in victory and defeat. Moreover, he stands up for what matters to him regardless of potential consequence - something many of us could learn from.