[Restorer]

Perhaps a prosperous society developed on those now sunken plains; gentle, little people learned to dress elegantly in tassels and mini-skirts and to decorate their hair elaborately.

Very odd. What basis is there for thinking these people were either little or gentle? Maybe they painted cute little pictures in between torture sessions.

Probably the same reason that archaeologists assumed the ancient Maya were peaceful ... until their writings were deciphered and it was learned they were about as bloodthirsty (literally!) as any people in history.

[chichilarue]

This is really not the point. The point is not about whether the pre-Aboriginals were advanced or not or nice or not, but why there's a cover-up of their existence.