You realize people can be aware of the negative consequences of their actions and still make a "stupid" choice, correct?
I would say that's true using a strict definition of the term, and is definitely true for common usage of the term.
In the future, you should just tell people up front when you're going to redefine terms to suit your needs (in your article and in your posts here, you apparently define "useful" as "providing immediate gratification with no consideration of any long term effects" and you seem to be define "stupid" only as "making decisions without full knowledge of the consequences" above) rather than confusing nearly everyone who reads your writing.
I would say that's true using a strict definition of the term, and is definitely true for common usage of the term.
In the future, you should just tell people up front when you're going to redefine terms to suit your needs (in your article and in your posts here, you apparently define "useful" as "providing immediate gratification with no consideration of any long term effects" and you seem to be define "stupid" only as "making decisions without full knowledge of the consequences" above) rather than confusing nearly everyone who reads your writing.