The point is that these images are so realistic that it's difficult to tell they're fake. Your weird Soviet analogy is not remotely the same thing -- making a teenage girl think that everyone in her life has seen her expose herself sexually and done things she hadn't really done is personally humiliating and devastating in a way scrawling some political heresy about a public figure is obviously not. Kids have literally committed suicide over shit like this.
Something millions died to protect in the great patriotic war.
Again, symbolic violence is worse than real violence to a lot of people.