Geralt the terminator crushing people's head While I agree with you that Geralt crushing heads is ridicules, I strongly believe that Geralt in Wtcher 3 is going to be extremely more violent than in the books and previous games. Geralt in Witcher 3 is a different person from the books and previous games, because he is unstable. His life from the books or his lost memories and the new life and perspective on the world from games are now colliding, riddling him with confusion and anger (when you don't remember something that makes you angry). As far as he knows the hunt is responsible for this situation, and the hunt is threatening the life of all his loved ones including his friends. He sees one path, killing and destroying the wild Hunt and whoever that stands in his way to save his loved ones. He has to do it fast because he is short on time. Any bandit or animal that stands in his way is an obstacle and no different than the wild hunt itself to him. I believe he would resort to violence even when it comes to gathering information about the hunt. He also feels the fact the the hunt would go after his loved ones is his fault. I assume the hunt is going after his loved ones, because that is how they got to him the first time by snatching Yennefer.
You got a point there ;-) Would make sense if he's in a hurry and thus acting "abnormal" for the sake of his beloved ones