Whoa whoa whoa... bringing up Na- er, 1940's Germany and comparing it to Garlemald is bound to make... certain posters... rather unhappy. While I only find the comparison slightly distasteful due to what I perceive as similarities, it's been brought up before and some people really don't like the comparison. Just... tread lightly.

Lies by omission are still lies - and "Solus" lied about a lot more than the Burn and eikons.

Lie: The Burn was caused by eikons.
Fact: Allag did it. (Eikons might be able to cause a similar phenomenon.)

Lie: Religion invariably leads to eikon summons.
Fact: Not a strict truth, and certainly less likely (if not impossible) prior to Silvertear.

Lie: Garleans are superior to other races in every way save their inability to wield magicks.
Truth: Not scientifically proven; the source for this idea (Aulus) is undoubtedly biased.

The big one, though?

Lie: The Empire's mission is to stamp out eikon summons and bring order to the world.
Truth: The Empire's mission is to cause eikon summons and bring chaos to the world.

That last bit is what causes so much friction between Varis and his, er, handlers. Varis genuinely believes in the ideals (lies) he was brought up to believe in; now knowing they're lies, it's anyone's guess whether he'll turn his back on those ideals or try to make the fictional narrative into reality. The same goes for any Imperial supporter who ardently believes in the Empire's ideals, assuming they were to find out the truth.