NDAA Protests End In Ironic Swarm Of Arrests

I'm spreading it too...

Maybe, maybe not. When you select a venue for this type of activity your choice of venue should depend on what objective you are trying to accomplish that advances your overall goal. There may very well have been more effective venues, we can't say for sure unless you know the activist's particular objective.
After some possible internal organization of likeminded activists, usually the activist's first objective toward any goal is to alert the general public that there is indeed a problem. Reasonable estimates would probably put public awareness of even the existence of something known by the acronym "NDAA" at less than 3% of the U.S. Population.
One of the best ways to raise awareness that there is a problem is to make the general public’s day less than normal. Shatter the normal expectation an ordinary person has when going to a specific location. Slightly break the routine day of the businessman commuting into the city, of the civil service employee working the station and of others who routinely use the subway.
They may be slightly irked and annoyed by a minor disruption of their routine and shaking of their expectation of a normal experience, but the feeling will likely cause them to think that something is out of the ordinary in their myopic world, something could possibly be...wrong.
When trying to achieve an awareness objective like this you don’t yet need to make the full argument as to “why”. Just repeatedly identify to the “audience” the label pertaining to the issue or problem . Let them know you are (slightly) disrupting their normal daily routine by shouting, chanting, waving signs and getting arrested because you are against what you specifically identified and labeled. Let them go home with the feeling from disruption of their daily routine thinking “the impassioned protestors seemed strongly against this thing ___”. Let the human trait of curiosity do its work and have them ponder the “why”.
In this instance if their objective was to raise awareness amongst a diversity of different types of people, then Grand Central Terminal is an excellent venue. Likely it gave an abnormal experience to a decent cross section of the population in the northeast region, as many different types of people commute in and out of the city.
Again whether or not it was a good venue depends on what objective toward their overall goal the protestors were trying to achieve.

Good point. But, given the reactive nature of the American public, it's as likely almost everyone there viewed the disruption as a handful of loudmouths with purple hair getting in their way. Subdued pamphleting might well be more productive. It'd be better if the folks who took the time to OWS Grand Central would have stormed and occupied Goldman Sachs, and got arrested there. Then they'd be on TV, where they provide thoughful entertainment and might actually get through to a few folks on the folks' own terms, which inspires responsivity instead of reactivity. It's a matter of courage, and leadership.

Otherwise, it's fine to appear on current and highlight the video here, but we mostly think the same sorts of things. It's preaching to the choir. If protesters are going to make a difference, they have to make a more lucrative investment of their time - like Goldman Sachs, or the Pentagon (see below).

Preaching to the choir indeed. But I’m not sure I’d go as far as to call it neoliberal stupidity. Exercising your freedom of speech is not stupidity. Could they have chosen a better location? - Absolutely. And as you suggested, there were more covert ways to get their point across than mic-checking Grand Central. But there was a meaning and a purpose behind what they were trying to say. You ask me, they have to up the ante. They gotta start thinking on a much larger scale.

Thanks. But, "covert" is not the proper term. I'd like to see "in your face," thoughtfully applied. And, not the public "face," but the Corporate "face." Follow the money.

....of right-wing-corporate-fascist oppression.

I don't think it's left or right wing, it appears to be a full bird of corporate oppression.

So is the left-wing... Both are oppressive!