If I'm getting all these right, you're telling me that Satoshi, the founder of Bitcoin and the genesis block miner, had 1,000,000 BTC from the 20,000 blocks he solved. AND because he lost faith in this project becoming reality, he didn't care about them enough and lost the goddamn keys to this 1mil btc?
Damn son! I'd be hiding from my stupidity as well...
No, I am saying that Bitcoin wasn't worth anything for the first 18 months and therefore people including Satoshi didn't care much about preserving the private keys. Remember the 10,000 BTC pizza transaction? That transaction took place at the end of May 2010 which kind of established any worth for BTC for the first time. Think of it like something that was like a penny but wasn't even close to worth a penny. If you dropped one of those pennies, I bet you wouldn't care much.
There are only two explanations I can think of that Satoshi's coins aren't moving. Either Satoshi had second thoughts about scarcity and decided there should be less coins in circulation and deliberately put theirs beyond use. Or, more likely, when Satoshi said they were "moving on" they meant that figuratively to say they were dying.
Satoshi wouldn't have accidentally lost access. It's not even remotely plausible. Either it was deliberate or it was something outside of their control (like mortality).