It strikes me that the effort that goes into trying to outright suppress disinformation is also a waste of time. It leaks through anyway and the consequences of being seen to suppress it leads to distrust.
All that you can hope is that the person reading it is open to information and changing their mind. If they are not then there is nothing that can be done anyway.
I have been drawn into trying to evaluate this claim that the Czech Republic / Czechia has had a statement issued by its "Supreme Prosecutor" that anyone supporting the Russian invasion of Ukraine will face criminal penalties. I would love to be able to go to a reputable media source to evaluate it. It is inordinately difficult to judge. I would prefer that the BBC/CNN/LA Times spent time debunking this sort of thing or confirming it. As it is I am on my own with nothing but a wall of flag-waving and emotional condemnation instead of investigative journalism -- that's what I want from the media -- not opinion pieces: https://news.ycombinator.com/item?id=30560672
In looking at that story it was fascinating to see the struggle within the Czech Republic with various sides accused of being Russian mouthpieces and the establishment of state censorship apparatuses well in advance of this phase of the conflict with Russia.