Common sense is overrated. Trump's "energy plan" for the country is one example of how Trump has a hard time even with common sense. He blames environmental regulations, for example, for the decline in coal when the cheap price of natural gas is the culprit--I guess there's a limit to how much Trump likes the free-market. Trump doesn't even have an energy plan, he has an (incoherent) speech. But that's a-okay by most Republicans. They and their leader have so much common sense as everyone has seen. 
https://www.washingtonpost.com/opinions/donald-trumps-dangerous-nonsensical-energy-plan/2016/05/29/c527cf04-2433-11e6-aa84-42391ba52c91_story.html
http://freakonomics.com/2011/09/29/the-myth-of-common-sense-why-the-social-world-is-less-obvious-than-it-seems/