However, there is still some part of me that is screaming these positions are important only because of the potential opponents that can take the reigns instead.
This is why both are important. Even if you don't accomplish much in office, you can keep the greater evil out of office. We need to offset as much systematic evil as possible if we want direct action to be effective. Politicians won't save us, but some of them will absolutely make things worse.
If you've never watched it, it's a surprisingly emotional story about the horrors of war, and the power of cooperation. Yes, really.