I would say, if there is a fight to be fought, let it be your fight.
Ray Franz wrote a book becuase that's what he was, a writer. Bill Bowen founded an anti-pedophilia activist group because that was the issue that he personally was facing. AlanF wrote essays because he is a researcher. Simon, Quotes and others created websites because they are web geeks. Etc.
So if there is something that is in your nature and circumstances to do, then go ahead and do it. But don't feel obligated to find something to do if the shoe doesn't fit. You've done more than enough of that for one lifetime.