If all you've ever heard are dry academic arguments against it and impassioned arguments about "freedom" for it, you won't even understand why anyone would be against it. Many people don't even know that there even is an issue. Kids don't get why lolicon is wrong, and all they ever hear is that it's freedom of expression! If someone hears at least one impassioned argument against it, they might care. Because that's the problem. Nobody cares.
Either way, quoting Lenin isn't exactly good "optics" either.