Why would you think skepticism would be a suitable response to misinformation? The only mathematically viable way to combat such misinformation is to disenfranchise people too stupid to be in charge of anything that effects other people's lives.
An elected president might be a lot of stuff, some of them bad, but stupid he surely isn't.
https://www.nber.org/digest/may07/effects-immigration-africa...
http://heather.cs.ucdavis.edu/pub/Immigration/EffOnMinoritie...
https://www.c-span.org/video/?204714-1/illegal-immigration-a...
Intelligence is not a prerequisite for being elected, and in many cases intelligence is a disadvantage. Most people are stupid, and they would rather see one of their own in positions of power. Dumb people can more easily connect with certain areas of the electorate.
Examples of this phenomenon are so copious and obvious that I shan't point them out.