On the surface it is about preventing deletion.

But the subtext is that any 'discoveries' or 'corrections' will be rejected out of hand.

The prime ones being the recent corrections to the land temperature record that cooled the 1930s and 1940s and heated 2009 onwards yielding a steady linear increase graphic.

When those corrections are placed under the microscope and likely reversed, what will the reaction be ? Scientific shills of the Republicans are making up Alternative Facts... here is our precious archived dataset that true believers can reference.