There is a hell of a lot of difference between N.I in the 70's and a perfectly legal demonstration today. (and I speak as someone who has also done tours in N.I. in the early/mid 70's spending a lot of time in "bandit country" and going into the Maze when they (the internees) decided to riot).
Giving a clout around the ear to a naughty kid and beating on someone who is legally demonstrating - albeit it very vocally - are two totally different things.
In recent demos where the police have been more "forceful" than needed, there has been nothing to suggest that their lives were in danger and some of the actions of the police were totally out of order.
I am not a police basher in anyway but it is because of their tactics and the actions of a few of them (also the actions of a few of the demonstrators) which is stopping normal, law abiding citizens from actually attending demonstrations and voicing their dissatisfaction with government or other things.
^^^
Edit - It is massively different policing a demo in London now and one in NI in the 70's. In London you don't have an orchestrated line of people (often kids) about to part on a signal so the snipers can shoot at you like happened in Belfast and Londonderry.
You don't have people throwing petrol bombs at you in London, You don't, in general, have people in London waiting for the "snatch squad" to strike and trying to isolate them so they can be murdered.
Believe me I most certainly was in the "front line" quite often enough between 72 and 76.
And a, in the main, peaceful demonstration in London is very very different and requires different policing.
When and if it ever gets to the point where there are snipers and petrol bombs then things can change, until then I expect the police to be a little more restrained even under provocation.
Bandit country to us was the border area around Crossmaglen upto Enniskillen.