Maybe you have in mind "supernatural" for "woo." In which case, alien abductions would not necessarily be supernatural, so it is in a different category of extremely stupid than, say, horoscopes.
The thing is, the people who claim to be abducted by aliens seem to have serious mental problems. The kind for which one can be involuntarily hospitalized, as opposed to just being regarded as a stupid fool, as is generally the case for those who believe in horoscopes.
Now, it is different if one does not claim to have been abducted by aliens, but believes others who have claimed to be abducted by aliens. But they are believing people who are crazy, which does not reflect well on their ability to evaluate evidence, and seems quite a different situation from believing in horoscopes (though that, too, involves problems in evaluating evidence, but a different problem or set of problems).
The thing is, the people who claim to be abducted by aliens seem to have serious mental problems. The kind for which one can be involuntarily hospitalized, as opposed to just being regarded as a stupid fool, as is generally the case for those who believe in horoscopes.
Now, it is different if one does not claim to have been abducted by aliens, but believes others who have claimed to be abducted by aliens. But they are believing people who are crazy, which does not reflect well on their ability to evaluate evidence, and seems quite a different situation from believing in horoscopes (though that, too, involves problems in evaluating evidence, but a different problem or set of problems).
"A wise man ... proportions his belief to the evidence."
— David Hume, An Enquiry Concerning Human Understanding, Section X, Part I.
