Apathy is absolutely the problem, but "just" getting out there and voting means replacing them with whatever new asshats the existing donor class selects for you. Actual change is going to require voting, and then getting back out there the next day (and every day thereafter) to hold their feet to the fire through direct action, strikes, organizing, protests, call campaigns, and every other tool at our disposal. Pretending otherwise is almost as much of a disservice as the "voting changes nothing argument.

That said, there is a way of not voting that DOES make a difference. Politicians DO pay attention to the differences between votes for various party members on the same ballot. So if you really can't stomach voting for someone, voting for down (or up) ballot races and leaving that one office blank tells them their policies are unpopular with voting members of "their own" party - and that WILL scare them in a way that low turnout won't.