Bloody hell.
Imagine your son, DH or brother (for in this case the police were all men) had tackled a murderous man, wielding a knife, still trying to stab the police, a man who may well have had explosives or other weapons, imagine your loved one had put themself in harm's way to bring him down before he stabbed someone else...and the public (advised by a martial arts hobbyist) are all up in arms criticising rather than praising.
Well done that member of the public, too.
Of course the police must be accountable, had they beat him up in the van on the way to the cells, it would have been unacceptable, but the know it all bleating about what they should or shouldn't have done in the one minute they had to apprehend and disarm him is just ridiculous.
I am a member of the public the police protect - I don't want them flicking through a training manual or doing calming exercises before deciding to tackle a man with a knife intent on killing me.
Well done those police officers, well done and thank you.