Considering it's called common sense.... it isn't so common these days! hahaha There is an art and intelligence to making and following a script as well as thinking off the cuff and ad-libbing. It takes a wit to do both. Then there are the b.s.ers. They sound like they remember or know what the script is... or that they know what they are saying when they go off script. Discerning can be difficult in this age of feigned intellects we find ourselves in. Everybody is an expert because Google tells them that they are!
I think one of the main problems is that not many seek the credibility of a source. Just because it's accessible and on the internet doesn't give it value or worth. Confirmation bias filled google searches is the bane of critical thinking.