Oldscratch, I am not going to demean your assertion that there are other valuable and valid ways of obtaining a change in society than voting. However, your assertion that, absent voting, those methods work is untenable in the face of evidence.
Let’s go back to the specific example I cited, namely the change in government caused by the Great Depression. Mind you, this was a VERY significant change; we still see its effects today. Federal government went from a relatively small operation to a big-time organization that involves itself in all sorts of daily activities of Americans. But that change didn’t come about because of strikes, riots, marches, etc.
Proof, you ask? Plenty. People tend to forget that Hoover remained President through three and a half years of Depression. During those years (November '29 to March '33), the Republican federal government did very little to change the way it governed the country. The Republicans, despite a LOT of protest from people, were not willing to change their thinking about ‘big’ government to meet the needs of the time. Mind you, there were quite a few riots, strikes, and other protests in those years.
However, in the first 100 days of the Roosevelt Administration, there was a clean sweep of the way federal government handled social issues. Now that didn’t end the issue; the Supreme Court, filled with Republican appointed justices, tended to throw out the laws the Conress, now Democratically dominated, had passed to deal with the situation; Lochner and its progeny were not yet dead and substantive due process still held sway. BUT, that ended when the elected President made some appointments of his own to the court, and then threatened wholesale changes in the Court’s membership and way of doing business.
SOOOOOOOOO, you see, the changes that were effected, while certainly influenced by public opinion as set forth in demonstrations, etc., would never have come about if the Republicans had maintained control of the White House and Congress. They didn’t, because people did something important: they voted.