They are also driven by real incidents: No sane person alleges that George Floyd isn't dead, for example. Whereas with witchcraft and many of the others the alleged "harm" was vague, nonexistent, or impossible to link.
BLM and metoo are also bottom-up movements, whereas most of the others were either initiated from the authorities or were authoritarian responses to popular demands (Prohibition is probably the latter).
The paedophile scare is complicated. There do appear to be fantasists and "recovered memory" incidents, but there is also a lot of historic child abuse that was institutionalised. Magdalene laundries, for example.
Mob justice is the weapon of last resort. The best answer to mob justice is an official justice system where justice is seen to be done. This requires tackling prejudice about whose crimes are investigated, whose are exonerated, and whose evidence is taken more seriously. How many women's testimony equals one man's testimony, for example?