And also the reason given in Time Bandits. But there are some interesting questions to be asked about intentionality and about how things that were originally perfect could be capable of backsliding. And how we got stuck in version 1.0 of reality. Never buy version 1.0.
I choose to accept as source something rather older than twentysome years.
As to your questions, again that has to do with free will. And you can only validly state "how I got stuck in version 1.0 of reality".