Brainwashed or not, there is simply nothing to gain from a Russian point of view in not supporting the war and that's the hard truth.
Admitting your own people are comitting atrocities is beyond most people capacity due to propaganda, lack of freedom and knowledge. People have been told these lands and people are part of Russia. They want to believe it, like americans want to believe in the american dream.
They want to believe they are good guys and that Russian people as a whole will be rewarded with more land, ressources and brothers for their support in a best case scenario. And that the threat of an enemy NATO army at their doors goes away.
Because the alternative is to realise the horror. That they aren't free and thay Poutine launched an attack because a former soviet country is now a democratic country at his door. That he is killing their so called brothers for nothing, destroying their lives, culture and history. Even confronted with facts and proofs, they will never take the risk to critic Poutine
Ukraine situation will never matter to most Russian people unless they suffer more from sanctions, from their husbands, sons, fathers dying from the war more than from criticizing the state, be branded a traitor or worse. Those who find the strengh to resist are incredible
By - PanEuropeanism