NO!
Have you seen the video? The use of spray was not on anyone who was in any way a threat.
I said, anyone resisting arrest is asking for trouble.. In this case the Police may have been unjustified in doing what they did. I wasn't there to see it, but if the protesters and/or witnesses feel they have a case, they should lodge a formal complaint.
There is an issue of proportionality you're failing to acknowledge, even before we come to the justice of a given protest's cause and methods set against the police's role of defend the target.
YES! I agree with you, I was making a wider point. Police response to any situation should be proportionate.
I was making a general point. I agree, in this case, the bill to the taxpayer is not a concern
Even if we ignore the justice element and just go with your tory pounds and pence vision, what do you think the comparative costs are of arresting and detaining someone versus not doing so and permitting the 'havoc' that ensues when they put a leaflet through a door?