Because at the end of the day people chose what they want to believe in based on their own beliefs, values and biases, making the poop stick. Like how there were (are?) people who believed that there's a secret basement in a pizza restaurant used by politicians to hurt children.
Wait, you're suggesting because "people chose what they want to believe in based on their own beliefs, values and biases, making the poop stick", politicians are justified in suppressing truthful news stories?