I’d give them a pass pre-internet, but today? In the age were everything is connected, and russia wasn’t like NK which controls everything their citizens see, they have access to the Internet. Which at bare minimum gives them some views outside of the propaganda, they shouldn’t be this supportive of this war.
There is no proof of this and no the odds of this being why they didn’t leave is so low. Most people in small rural towns don’t have options of employment, so factory work is really all they have access to. It’s a reason why small rural towns die when the mine or factory shuts down.