I support Ukraine 100%. I'm glad the UK and EU and US are sending weapons and aid. I'm glad that some Russians are vocally against the war. But honestly I don't know what people expect the Russian protests to accomplish. I don't know how big would be "too big to ignore" - it doesn't seem possible.
The only charitable interpretation I can come up with is that they maybe live in a democracy and are too used to politics being completely devoid of any danger. It's easy to have strong convictions and strongly held opinions/values in a peaceful democracy, but it's completely different when politics involve violence and can ruin your whole life.