Or, generous scarcity.  Self depricating wit?  Sometimes things are best left unsaid.  Sometimes things are said as fact when they're opinion, and nothing more.  It's certain that can be said of everything.  Then again, sometimes fact can be gleaned in a way that defies the myth of scientific rigor.

"Just because...doesn't mean...." 
A clause that comes in handy.

Here are collected a gathering of short essays and observations by Stephen Allen.  He organizes this work with the title "Polemics."  It sounds great in an educated sort of way.  The wiki on "polemics" says:

"A polemic is contentious rhetoric that is intended to support a specific position by aggressive claims and undermining of the opposing position.  The word is derived from Greek
πολεμικός (polemikos), meaning 'warlike, hostile', from πόλεμος (polemos), meaning 'war.'"

Prominent in that definition is the word "rhetoric."  The wiki on "rhetoric" is:

"Rhetoric is the art of discourse, wherein a writer or speaker strives to inform, persuade or motivate particular audiences in specific situations. As a subject of formal study and a productive civic practice, rhetoric has played a central role in the European tradition."

Given that, it's probably an accurate title.  Though, it must be considered these writings might be factually accurate observation, and not opinion.

Just because you might disagree, doesn't mean it isn't so.