Does one have to be an iconoclast or revolutionary these days to be validly left? I consider myself to be left of center, and very much in favor of progressive policies.
However I find myself being disagreed with quite often, mostly for not advocating or cheering violence, "by any means possible" change, or revolutionary tactics. It would seem that I'm not viewed as authentically holding my view unless I advocate extreme, violent, or radical action to accomplish it.
Those seem like two different things to me.
Edit: TO COMMUNISTS,ANARCHISTS, OR ANYONE ELSE CALLING FOR THE OVERTHROW OF SOCIETY
Change never comes without a fight. In the shadows, blood is spilled, and it will continue to flow. Today, it's not yours, but tomorrow it might be. Some saw the suffering of others and chose to sacrifice, so others wouldn't have to. At least be thankful for their sacrifice.
Many of those have been accomplished by protests, that led to changes in law, that led to changes in society. Some by war, yes.
None by revolution, that I'm aware of. None by anarchy, that I'm aware of. In most cases revolution seems to throw things the other way, back into slavery, back into repression.
This is ahistorical, really. Revolution has historically happened in progressive movements beyond brutal previous conditions, whether it be the Haitian Slave Revolt, the French overthrow of the Monarchy, the Russian overthrow of the brutal Tsarist regime, the Cuban revolt against slavery and fascism, and more.
I think you would do well for yourself by studying history of revolutionary movements.
Some have, yes, but of the ones I listed, absolutely not.
Revolution isn't an action, it's a consequence of failing and unsustainable conditions. You don't do a Revolution, it happens and you can participate in it.