Or, Peace, it is to be ill-informed, and/or just conventionally-minded. A lot of people who are basically not technically stupid at all are nevertheless ill-informed...and most of them are conventionally-minded as well.

Add to that the fact that most people who already have formed an established opinion on anything will go on defending it to the bitter end, because their ego is involved in defending it...and you have the engine that runs the endless debates on this forum.

A tragicomedy, I call it.