This is a System Dampener within the complex system of a social media network.
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Allowing users to block each other on social media reduces the number of immediate conflicts. But it also means that the public debate becomes fractured into different areas and thus just masks the symptoms of the social fracturing.
Like a Tranquilizers it hides the symptoms of social discord.
In fact because it stops people different views from talking with each other it can increase the underlying amount of social discord. See Twitter has gotten worse under Elon Musk - Or has it?