Perhaps gp could have worded it a bit more kindly, but I think there is value in calling out people who espouse opinions without having sufficient knowledge to back it up. It's people like this who degrade and limit useful discourse.

My heart goes out to op and everyone else who has been unfairly effected by this conflict.

They didn't just have an opinion, they said it was nonsense.

Ok. He was obviously wrong. He made a prediction about the future and was wrong.

But to say because he was wrong this time, he "didn't have sufficient knowledge" is just kind of dumb itself.

He's probably way more aware of what Ukrainians are feeling about the situation and their opinions on what's happening than we are. You can have a lot of knowledge, but still be wrong. Lambasting people and insulting them for the apparent sin of simply being wrong is the thing that's degraded and limited useful discourse.