There is something deeply unsettling about the fetishisation of people who think they are left-wing. If you properly look at, say, the history of the campaign for female suffrage, you might actually see a complex series of events, in which ideas are contested, and concepts of suffrage are rearranged to allow women to vote. It takes a total of 58 years between the election of the first female politicians in 1870, and full female suffrage in England and Wales in 1928. That's not that long in terms of political change.
So, we have a significant political change, driven by the input of a lot of people, mostly involved in peaceful political campaigning. Those people, however, get their important contributions marginalised, and instead the people who only think that they are left-wing fixate on the small and terribly unproductive women who sent out bombs in what was arguably a counter-productive contribution to the cause.
And it is typically thus with violent protest. Some people who identify as being on the left love this, as it allows them to cast themselves and their movements as being freedom fighters, heroically sticking it to the man, and forcibly taking their freedoms from their oppressors. In reality, it's generally it's mostly just idiots taking an opportunity to punch others, and feel good about themselves afterwards.