It is a chicken and egg problem.

The real root cause as you said is very likely down to individual’s media literacy and critical thinking skills. But the solution to educate everyone from ground up would be very costly and less efficient.

From an efficiency perspective, the government have to figure out ways to stop misinformation from spreading in short term. And hopefully, next few generation will have better critical thinking and analytic skills to online information.

I don’t know how they would draw the line between misinformation and first amendment. But hopefully, a competent government will see this as a problem and find solutions to it.