No, everyone is a lot nicer than these cherry picked videos we all see online.
For every one instance of this, I can show you thousands of everyone being good to each other.
The video shows him shooting at the dog running away.
If you get scared this quickly and react this violently, how are you allowed to hold a firearm in public.
I think context is important here.
The student with the shotgun went in the class room intending to end his own life, not as a school shooter.
This coach with great compassion and steel balls took the shotgun from him and the rest is on video.