You wake up, you remember. You are alone, everyone is dead, your family. You were never really close to anyone, but you just want to see a familiar face for once. Everything has been wiped out, the plague rules the earth now. You have to start again. You got away from the populated areas, you ran as fast as you could. But they still follow into the darkness, the light is their predator but you are just their prey. As night falls, you think you are safe but they just keep bashing on the door, finally the door caves in and you get up and fight them off until the morning, you now realise that you can't live like this, so what do you do? Mine, Build, Craft, Survive!
This is the only real explanation for minecraft.
Believe it,
See it!