What to do with left-wing agitators?

Earlier today, we had a group of left-wing agitators attack a UKIP press conference for no reason other than that they didn't agree with them and hence didn't want them to have their say. Last month, the same kind of people were dancing in the street at the death of an elderly lady whose time in office most of them could not remember. The EDL are derided as violent thugs, yet I know from personal experience that most of the violence at their demos tends to come from the so-called "anti-fascists" giving it everything they have to try to stop the demonstrations from taking place, in the name of tolerance.
Given that a general political shift to the right and further cuts to public services are inevitable, it's also inevitable that these incidents will increase in number, and likely in intensity. What to do then, when these people react to the fallout of their unworkable ideology in the only way they know how: violence and petulant rage?
If and when a repeat of the 2011 riots takes place, I would personally be quite happy and gratified to see the police give all present a warning to vacate the area immediately, and if that falls on deaf ears then give them a taste of water cannon, tear gas, rubber bullets, CS spray, baton charges etc until they get the message.
I am aware though that not only do I most likely not have the wisdom or life experience needed to be entrusted with making these decisions, but spending enough time reading the comments sections of the Guardian has also taught me that these people thrive on a feeling of self-righteousness gleaned from the false sense of being oppressed - so is it really wise to foster that, or is it wiser in a sense to allow the consequences of their bankrupt ideology to go up in flames so badly that even they see how destructive it is? Do we want to suppress the instincts that cause the scenes like I have described above, yet keep them alive bubbling away under the surface, or let them destroy themselves?
Given that a general political shift to the right and further cuts to public services are inevitable, it's also inevitable that these incidents will increase in number, and likely in intensity. What to do then, when these people react to the fallout of their unworkable ideology in the only way they know how: violence and petulant rage?
If and when a repeat of the 2011 riots takes place, I would personally be quite happy and gratified to see the police give all present a warning to vacate the area immediately, and if that falls on deaf ears then give them a taste of water cannon, tear gas, rubber bullets, CS spray, baton charges etc until they get the message.
I am aware though that not only do I most likely not have the wisdom or life experience needed to be entrusted with making these decisions, but spending enough time reading the comments sections of the Guardian has also taught me that these people thrive on a feeling of self-righteousness gleaned from the false sense of being oppressed - so is it really wise to foster that, or is it wiser in a sense to allow the consequences of their bankrupt ideology to go up in flames so badly that even they see how destructive it is? Do we want to suppress the instincts that cause the scenes like I have described above, yet keep them alive bubbling away under the surface, or let them destroy themselves?