Why is Scientific Literacy important?

“So that you can dismiss information that is untrue and potentially harmful. Being science literate means that you can examine the evidence behind a claim like “vaccines cause autism” or “GMOs cause cancer” or “evolution is a lie from the pit of hell” and not be fooled by psuedoscience, opinions, logical fallacies, and fear mongering masquerading as fact.”

A comment from user raiju on an open discussion on the tech site io9 about why being knowledgeable in science is so important.

Why do you think that this is a critical issue?