On Spam

My self-selected quote from an email to a University mailing list:

I think at some point we have to depend on the recipients to use his/her
most powerful computer of all, and apply the same critical thinking and
reasoning skills that we demand of them in their University pursuits to
determine the legitimacy of online communication.

I am beginning to believe more and more and more that people turn their brains off when using the computer. Why is that?