It's not that stupid people do stupid things, it's that people who are ignorant to learning choose their own way to do things without having correct knowledge to do those things, utterly marking them...
Not all of the users of the site are dedicated to giving useful, honest answers to the questions. Whatever their reasons, they should not be seen as representative of our valued users and...
Stupid (as in stupid people) are what they are stupid in. So if they are stupid when answering questions, for example, they they are stupid in that category of expertise. Hope this helps.