I always thought of cancel culture as people facing "consequences" for their opinions, rather than their actions. Although I guess the can also be applied fairly innocuous actions that don't cause much (or any) harm.

The common thing with both is that it has people make mountains out of molehills. How can you trust someone that is willing to damage someone's life for something that small or non-existent, especially if it is just an opinion. They could easily come for you if they don't like something you say or do.