People know they should get vaccinated to prevent a range of diseases and they don't. People know they should use condoms to prevent diseases and unplanned pregnancies and they don't use them, people know they should wear seat belts and they don't want to use them either, or helmets. People know they shouldn't drive drunk and they do anyway, people know they shouldn't do certain drugs and that's it! They love it... and the list goes on. Then they say that humans are superior to other species, but if you look at these things you realize that's not true.