Mark was a kid. Mark was a subpar coder. Mark had too much money at his hands and became cocky about his success.
What could possibly go wrong?

Looking back, I think its worth mentioning that many of the important players in Bitcoin's early ecosystem's development were kids with too much money. Which is probably a good enough explanation for the amount of failure we've seen.

Then again, I'm an old grumpy man and always complain about the young