And why did (or should) the "Fairness Doctrine" apply to radio and not TV? Because the liberals had a 100% monopoly on TV News before Fox News came along and wanted it to stay that way. The reason radio became a conservative bastion is because conservatives had nowhere else to go.
Your comments on Oswald are ridiculous in several different ways. Plus, you certainly aren't noticing that the FBI list of mass killings is heavily weighted toward white suupremacists. Plus, it was the right wing from Trump to the white supremacist groups who attempted to overthrow our democracy on Jan 6. To say you got this whole topic absolutely backwards is an understatement.