That's not the point and I never said that.
There are sometimes people joining the legitimate protests for their own (bad) reasons.
Sometimes deliberately by the government agents provocateur.

Both with the same result. Demonizing the protests.
The press will invariably only focus on that fringe group and call all of them "troublemakers"or whatever.
(As you implied by using quote marks)

The general public will dislike them and not even know about the legitimate demands of their protest.

Simple tactics that work on gullible people