The pretext of child abuse prevention is used as a plausibly-deniable dog whistle to automatically discredit and demonize anyone who dares speak out against the proposed law.

It's got nothing to do whether the law would be actually effective at curbing such abuse, whether it will have harmful (seemingly-) unintended consequences, whether other solutions would be more effective or have less potential for unintended consequences, or whether the problem is actually widespread enough to even worry about compared to other risks that affect children.