I agree karmalady. Theres a lot more to this than meets the eye, and, yes, whilst the police officer didn’t use complete restraint, once the perpetrator was down, and probably should have done, the situation was serious and it’s easy for those of us watching the footage from the comfort of our own homes to pass judgement - but we weren’t there, and we don’t know the full story. We don’t know the true circumstances the police officer and his colleagues were under, but I’d hazard a guess that the person they felled was not a nice, polite, young man, ready and willing to do as he was told.
As my DH said, he’s lucky it wasn’t in America - he’d probably be pushing up the daisies now, if it had been.