See, a lack of evidence leads _reasonable_ people to extreme skepticism. It is not an open invitation to invent a crackpot theory and then plug your ears while shouting "LA LA LA I CAN'T HEAR YOU."
Moreover, extraordinary claims require extraordinary proof. If you want to take Plato at his word you don't just get to point to a previously-undiscovered set of ruins somewhere in the Med and say "Atlantis!" You need to prove
a) that it was inhabited 8,000 years ago
b) that Athens was inhabited 8,000 years ago
c) That an apocalyptic war was fought between the two
because these are all parts of Plato's story.
You also don't get to say "the Egyptians told Solon/Plato/whoever" because archaeology proves that at the alleged time of this apocalyptic war the Egyptians (if you can call the Faiyum A culture "Egyptian" for any reason other than that the happened to leave near the Nile river delta) were still a Neolithic people with no system of writing.
Moreover, since all available evidence tells us that b) is not only not true but impossible, you're putting the cart before the horse trying to prove a) or c). If someone tells me, in earnest, that the CIA has been instructing him to kill the Pope by way of a radio embedded in his brain, nothing short of a CT scan showing me the radio and a bug detector showing signal origin at Langley is going to convince me that he's not insane. I don't start speculating on why the CIA would want the pope dead.
I realize that this type of reasoning from evidence rather than speculation is not the usual fare at the UFOlogy seminars and astrology club meetings you drag your knuckles to every night, but do pay attention, you might learn something.