Like everything else in this thread, no.
There was an article, yes. Hopefully you already have the opinion that hitting children is bad.
What you didn't have until today is evidence of what really happened.
Now you can have an informed opinion, not about hitting children, but about this specific incident.
I take that attitude about pretty much all news, be it homicide, zoning laws, BAD HOMBRES!!! I already have general opinions, but if you want me to have an opinion past that, give me the details, don't expect my blood to boil just because BAD HOMBRES!!! Because of course there are BAD HOMBRES!!! and no, I don't like BAD HOMBRES!!! but past that, what are you asking of me, exactly, and what are you giving to me to get that from me?
Past that, though, if it tuned out that this kid was some warrior teendrummer who was disrespecting Hino (and maybe had been all along, they'd worked together for a month), and Hino just stopped the shit cold went upside his head instead of opening up on him, then yeah, I wouldn't condone that, but my outrageometer would maybe bubble a few times and then quiet back down (and if you don't know the difference between going upside somebody's head and opening up on them, then, hey, not my problem).
This obviously, is not that. But until we saw the video, we did not know that. Now we do.
Now I will be outraged to the full extent that voicing outrage on a specialist bulletin board about an incident that happened had a world away between an old man and one of his students will have an effect. Where have you gone Johnny E?
OUTRAGE!!!