Are polls trustworthy either way at this point? People are getting jailed for showing up to protest at all. Answering ‘No’ or abstaining from participation just seems like you’re signing yourself up for a trip to the gulag.
They're probably pretty accurate, yes. Not that I agree with any of it; but Putin has a ton of "justifications" for what's happening in Ukraine right now. The main one being that the US & West are threatening Russia's entire existence via NATO expansion.
If most of the media around you is state-sanctioned and pro-Putin, it's super easy to go along with Putin's justifications.
It's easy to build domestic support for almost any war in the early days. It's the long hard reality of war that turns people against it.