I think a lot of people are extrapolating beyond the data presented (which isn't a lot from Pew). We're talking about American lack of scientific education and a general science problem in the US when in reality we're presented with three topics: Climate Change, Evolution, and Vaccines. It may or may not be fair to say the US has a climate change problem, or vaccination problem, but science itself is big.
Ask them about homeopathy, acupuncture, GMO's, magnetic wristbands, Airborne, if the moon landing was real, and whether we've been visited by aliens. Do you think the results will be different?