You’re right that Robinson was in the wrong on this one and that he did commit a crime; I wouldn’t have used him as an example had he not been brought up specifically.
Even in the U.S., there are people actively lobbying to use the government, usually state governments, to restrict the BDS movement. In my opinion there’s been a lot of media attention around silencing right wing speech in order to get the left to comply in undermining the underlying legal principles. But at the same time, quieter work is being done to restrict left wing speech as well. This has already been put in place in Europe and there seems to be bipartisan support for it in the U.S.
He's not being silenced because he's right wing. He's being silenced because he's jeopardising trials and threatening witnesses.