With magazines, television etc you are targeting everyone. So if you run an ad that said "Vote for me because I will build a border wall" then you will attract 30% of the population and alienate the other 70%.
With Facebook you can just target that 30% whilst guaranteeing the 70% won't be affected since they won't see the ads. That is the feature that is unique to Facebook that is causing all of the problems.
With magazines, television etc you are targeting everyone. So if you run an ad that said "Vote for me because I will build a border wall" then you will attract 30% of the population and alienate the other 70%.
With Facebook you can just target that 30% whilst guaranteeing the 70% won't be affected since they won't see the ads. That is the feature that is unique to Facebook that is causing all of the problems.