Propaganda/media is one of the most useful ways to steer a population, it even doesn't have to be particularly good propaganda if its voluminous and exclusive.
There is no more Belarus as a country. It is Russian puppet state with an appointed governor Lukashenko. Occupied by the Russian army at the moment. Those who were against are either in prisons or fled the country. The country is North Korea basically at the moment. Most of the people (~60%) hate Lukashenko and Putin.
And 60% is not that much to be honest.
It was very obvoius. They released a video of helicopter hits, high res artsy photos of destroyed armor, some dude flying a drone over a disabled UA tank zooming out to the Russian tank column and the Snake Island POWs calling home.
Propaganda works and CAN justify aggression in eyes of the people.