In the interests of accuracy, it is not ‘scum’ but police using intimidation and a certain level of force to carry out orders to prevent an “illegal” referendum. Which of course is Govt intimidation and abdication of democracy. In terms of those police themselves, it is clear they are trying to use minimal force, however awful it appears and it is of course just one incident, could be much worse in other situations.
And btw, I’m very much a fan/supporter of Catalonia, and Barcelona as a city in particular etc. I’m not sure how beneficial independence would be but that’s another story, if I lived there I would know more.