"no moderation should be applied because inconsistent moderation is worse than no moderation"
This is still your cognitive style of wanting hard and rigid categories for no good reason.The consistency of moderation is a spectrum, from very poor to average to excellent.
You're insisting on drawing a rigid binary of "inconsistent" versus "perfectly consistent", and saying that since "perfectly consistent" is impossible, the only alternative is "inconsistent" which is categorically worse than than no moderation by sheer virtue of the binary category that it's assigned to. This is the perfect solution fallacy.
"Actually I'm disputing the idea of "good and bad ideas" in this context"
Right, so if literal authoritarian Islamists became the dominant paradigm and Sharia was imposed on you by force you have no problem with it simply because that's what won in the marketplace of ideas. No, this is nihilistic moral relativism, and I know you conservative types don't really believe in moral relativism, it's probably just disingenuous posturing because you know right-leaning opinions tend to be banned more often in social media in the current moment, so it's helpful to adopt a stance on censorship that seems more principled and logically consistent. The left did this in the 1960s. If it was just ISIS propaganda being banned and nothing else I know I wouldn't be hearing any of these nihilistic relativistic arguments.