I'm always scrolling through the new rover pics.. And I have to admit that while some of them are absurd and too much of a stretch, a few are definitely remarkable.. I remember seeing one a while back of a hut of sorts built of stones sitting at the top of a martian sand dune.. And it's practically the only thing out there, and describing it in any other way without including intelligent design seems preposterous.
I wouldn't be surprised if human life stemmed from mars after some sort of environmental disaster that depleted the atmosphere. Naturally, they explored earth and found it to be suitable and possible for thriving life.. We made the move, and simply forgot about it in time, or it was written out of our past.. I've heard worse theories.. Perhaps they didnt have time to terraform Mars into a more suitable living environment, or perhaps, like earthlings today... believed that climate change wasnt real and let the SHTF.