You’re right it’s dependent on your trust level. It’s exactly an upzap in reverse.

Outlawing threshold is kind of arbitrary, but it’s ~5 downzaps from average trusted stackers. It’s like ~2 downzaps from very high trust stackers.

Beyond outlawing, it’s worth downzapping because it severs (meaningfully reduces) trust between you and whoever upzapped it … meaning overtime we’ll all see less of that kind of content on the front page.

At some point I’d like to reward downzappers too. Kind of like rewarding zapping top posts but the reverse - rewards for helping to find the worst stuff.