I don't think it was a dirty hit. He didn't use his helmet and he even pulled up a bit before he hit him. And while the throw was a little high, I don't even know that it was a "hospital ball". It was just one of those things that happens in football. I'm not sure what would be done to prevent it other than maybe Carr throwing the ball a foot lower, but very few QBs, Brees being the exception, have that level of accuracy most of the time. It's rare that a guy can play at the Brees level where he seems to just place the ball exactly where it needs to be every time. And I'm not sure what a QB is supposed to do. Not throw to a guy who is open and never throw the ball over the middle if there is anyone within 10 yards of the receiver?
So, most of it was just what happens when you play football. The other part is that Olave had already had one concussion a couple weeks ago and probably should not have been on the field since once you have one that recently, you are much more vulnerable to another one. He probably should have sat out for another few weeks and he also probably should have been wearing a guardian cover given his history.
There has also been talk that Olave needs to strengthen his neck muscles so that his head does not whip back as hard when he gets hit hard and so that his head does not slam into the turf as much or as hard when he lands on his back.