It makes a difference if his compatriots knew he was going to do it, and took material steps to help him do it or help him get away with doing it. They argued, I believe, that they didn't know and only intended to have a peaceful protest, but the jury decided that's not true.

That’s a lot of words for you don’t know what actually happened. /if

I don't know why you would phrase this so confrontationally. All I know is what the source article says, and it doesn't include much beyond the jury verdict that would let anyone guess what happened. If you have a link to the specific evidence that was presented at trial, or other detailed information, I'd love to see it!