Also, were there other people in the station? Were you the only one asked to leave, or were they clearing the whole platform?
I ask because I was in DC for the inauguration and the women's march, and there were thousands and thousands of protesters with costumes and signs of all sorts. It seems weird that they would single you out.
But it's possible that they thought you were carrying the protest on into the train station or some other place which they had safety concerns about.
There are multiple ways to handle a safety concern, one of which is just by talking to the individual and observing. Someone with a sign acting like all the other passengers isn't much of a worry, I think.
They see someone with a sign, and they try to get him to move along quickly before (potentially) a train load of additional protesters arrive.
I don't really know all the facts here, I am just offering an alternative way to interpet the facts provided.
To paraphrase the famous saying, evil succeeds when good men and women do nothing. I have seen this happen in my own country. Don't want to see it happen in the USA as well.
You can check out my twitter feed if you think I don't care about politics, but there are a ton of places where we can 'talk about these issues openly'. Just maybe spare this one site from all the politics? It tends to, uh, eclipse, everything else, as it is far more important.
Maybe, but maybe we'll lose this civility if we encourage this type of discussions.
Again these same types of arguments I've seen happen back home. People used to say stuff like "oh my god do we have to discuss politics here too??!" End result: the country slid down to authoritarianism and now everyone is fucked, even those who insisted on staying in their own little niche bubbles.
Even in an otherwise smart, rational and measured community, in this thread we're seeing appeals to emotion, partisan "outrage" and downvoted being used as a tool of disagreement.