There is obviously a difference ... but in terms of the amount of force (or "violence") inherent in the tactic there is no difference and that is the context in which I drew the comparison.That's disingenuous in the extreme.
The fact that YOU can see no justification is irrelevant. The law can. The Courts can. The ECHR can. The simple fact is that it IS a lawful tactic (so long as it can be justified). If, like any other police action, you think it has been used inappropriately then the way to change how they do things is through the Courts by making complaints / suing them. Fighting will NOT change anything (and, in fact, is far more likely to help the police justify use of the tactic in future).I can see no justification for this, none whatever. How is it not unlawful detention without charge of people exercising their democratic right to walk the streets?
You might as well say that YOU can see no justification for, say, the police closing the road after a major traffic accident and using that as the basis for fighting with and trying the get through the cordon.