This is the crux of the issue to me - this use of "comprised of" is a completely logical and consistent usage whether or not some people think it's wrong. Plenty of times correct constructions are considered wrong by lots of people, this is what leads to the phenomenon of "hypercorrections". I won't argue that this is necessarily one since the "corrections" don't strike me as better or worse, but languages are inherently subjective. For this reason I find it distasteful to go around enforcing linguistic policies on others.