Well you know, two areas I agree with the right on, are certain views on self defense and free speech. I believe in many of the other freedoms espoused by the left, such as rights to abortion etc. I don't have a party, except possibly some area of the libertarian party.
Anyway, I don't see how anyone, who watched the footage, could possibly defend the assailant. This seems like the most clear-cut case yet, as far as I can tell. Now details could be added that might change my opinion a bit, but as it stands, this seems like an example where defense is justified
I think an issue is, that in the united states, the state always wants a hand in any dispute - but how it can it justify this if circumstances often prevent its instantaneous intervention? It cannot magically be there instantly, to break apart the scene, that is impossible. And yet, it does not condone, apparently, individual defense by a non-state level civilian. This strikes me as a socially clunky policy.
I figure there must be money involved: if the state cannot reasonably be on hand to intervene, and perform the incarceration, in all circumstances, then somehow there is a funding hemorrhage. Though I don't understand the technical details of why or how that would be, that's what I suspect