I see writing and acting as different parts of the same continuum. Writing is better for intense emotion. If you're very angry about something, you shouldn't present it as strongly when you're acting. But if you're really angry and writing about it, that's the best way to get it out and across.
Social responsibility becomes an aspect not of Christian mission only, but also of Christian conversion. It is impossible to be truly converted to God without being thereby converted to our neighbor.