Why do people get so defensive when 'their side' is questioned? Is your solution to forever go back and forth silencing each other because the other guys did i

Why do people get so defensive when 'their side' is questioned? Is your solution to forever go back and forth silencing each other because the other guys did it first? I am not picking sides. I think it's unprofessional for the president to constantly call things like 'Fake News', but I don't remember them going to cable companies to try and get them canceled. And if they did, I oppose that just the same. Personally, I got so sick of all news being all Trump all the time, I question any claim that media was in any way silenced.