I don't think East vs West is a fair generalization of this attitude. In Thailand someone is building an Angkor Wat replica and the Cambodian government is protesting because they see it as somehow cheapening the original. Angkor Wat has undergone very little reconstruction and where it has it's only sections which can be mostly rebuilt from original fragments. In Vietnam you can visit lots of temples that are complete rebuilds. In Cambodia there are hundreds or even thousands of ancient temples, none of which have any restoration done, and there is no movement to do any.