I DON'T THINK ANYONE BLAMES YOU, and frankly you don't want to think too hard about the plot of any MGS game. Trying to summarize them made me throw my hands up in the air more than once. Also, nanomachines: the answer to everything.

(And if you like action games I can highly recommend Metal Gear Rising, it's the hottest shit since Bayonetta. Dismembering guys and ripping out their spines has never been this fun before. It's a little worrying. And also doesn't make a lot of sense in the end. THANKS KOJIMA.)