A lot of “doers” are similarly spinning their wheels/wasting their time with useless actions. Some of today’s most important movements and protests have started, and continue to grow, from behind a keyboard. It is (as in can be) the equivalent of yesteryear’s marcher. As you point out, it depends…it’s more about the issue and the effectiveness of the words/actions that is important, not about words vs. actions.
edit: let’s keep in mind that we are both, right now, trying to effect change in other’s opinion/view “from behind a keyboard”. That’s how it’s done, sometimes.