Giving a keynote is being honoured by the event organisers. You've been specifically invited to talk. You're the headliner of the event. It may not matter to y

Giving a keynote is being honoured by the event organisers. You've been specifically invited to talk. You're the headliner of the event. It may not matter to you as a listener, but I expect it would matter to you if you were asked to give such a talk. To have that taken away because you voiced a technical opinion some people didn't agree with is petty and childish. It wasn't even a political opinion, and it was public before he was voted on and invited.