That's the wrong thinking. During the BLM protests, there were almost certainly people who went too far, or took advantage of the chaos to create mayhem. They were not plants by the conservative right, it's just a natural thing that happens, people are unreliable like that.

During the HK protests, I can imagine the same thing happening. Actually, in only a few cases where a strong leader and organization is involved (MLK, Gandhi, etc...) can protests be largely peaceful and more effective (not giving the other side an excuse to crackdown without losing face, and even these movements weren't perfect).

I like your post, and I feel the same. If 100K protesters show up to protest about a police killing (BLM, et al), but 5 misbehave, does that mean all 100K are bad people? Of course, no. I would say exactly the same about the police. I write this as someone who respects the work that police do to secure our communities, but I also strongly support the BLM protests against grotestque police brutality against black and brown people in the United States.

Of course in a large crowd there's going to be a violent minority - that's just statistics.

Yet, planted https://en.wikipedia.org/wiki/Agent_provocateur are a well documented and widely used tactic. It has proven to be effective in many cases to justify a reaction in the eyes of public opinion.

> Yet, planted https://en.wikipedia.org/wiki/Agent_provocateur

A planted agent definitely in the realm of possibility, but it is just more likely that some kids took a chance to get angry, violent, and cause chaos. Some combination could also have happened (e.g. a plant takes advantage of enraging people who are already closed to being enraged). In all cases, better leadership and some practiced discipline that comes with that could have helped avoided the problems.