"Stupid"

Is it fair to use this word against those who persist in promoting religion, alternatives to medicine and all other pseudoscience in spite of knowledge readily available? In my opinion, yes.  Why? I present the definitions of stupid (given to unintelligent decisions or acts : acting in an unintelligent or careless manner) and ad hominem (appealing to one's prejudices, emotions, or special interests rather than to one's intellect or reason).

If I see someone crossing a busy street in the middle of traffic and not using the crosswalk with its safety signals, that person is acting stupid. Anyone intelligent and exposed to valid information about the dangers of such and does this warrants this label.  Likewise, using a cell phone in one's hand while driving qualifies.  You get the picture.  How is this different that continuing to accept the scientifically falsified claims from religion, alternatives to medicine and all other pseudoscience that are unwarranted and harmful?  

Please note, the definition of an ad hominem does not apply if one is appealing to one's intellect or reason.

Synonyms and Antonyms for "stupid"

You decide if I am wrong.