Use Picasso's Guernica as the visual for the T-shirt.

The power of that image, is that it is not immediately partisan but refers back to the Nazis and WW2, and the viewer can immediately grasp the comparison or at least be slightly puzzled and give it a moment's thought.

Juxtaposing the historic image with the present-tense phrasing of "There are hungry ids amok" is the subtle hook from the past atrocities to the present ones.  (However, don't use italics or other emphasis on the word "are" or any other word in your line; it stands beautifully just as it is, inviting the viewer to wonder whose hungry ids and how they are running amok.)  You might even want to have the URL for Talk2Action under the painting though in tastefully smaller lettering so it doesn't appear to be blatant advertising.  

And from the production angle, since Guernica was originally in black-and-white, this becomes relatively easy to do as a printing job.    

Also the T-shirt would have plausible deniability, for example if someone was arrested, detained, or questioned (e.g. at a shopping mall, or detained at an airport, etc.) for wearing it.  "This is a statement about the decline of morality in the world today.  I'm a good Republican, let me go!"  (One never knows when one might be called upon to save oneself from a trip to the dungeon; more and worse to come if present trends continue; and dissent will have to become more complex & indirect as it was in the Soviet Union...)