Don't worry, the Hydra will grow and his power to downvote will fade. We are a community, and together we are stronger than him. He may be an annoyance, but it was never given that we'd get all of our "potential rewards" anyway. Someone was bound to be unhinged enough to attack the Steem community to push their own petty moral arguments.

I fought him, then lost a bit of hope, but then I noticed the SBI community is huge compared to him. I made a pledge to give out SBI sponsorships every time he attacks me (I also publicly announced a new 500SP delegation to the SBI), and he hasn't attacked since.