Yes, the parent's point is that despite being restrained as you describe, the establishment still tried to paint MLK as a provocateur. Which speaks to my point that the status quo faction is always going to frame protestors this way in order to undermine them.
Yes and the videos of his peaceful marches and the brutality of the police ended up discrediting the establishment propaganda against him and bringing the American center to his side. It's the most historically successful strategy in activist history, but no one wants to do that because it doesn't feel good in the moment.