Upon reflection

But where is the blame? Should the trooper blame himself? He was cloned to be weak minded and easily pliable - why shouldn't he fall prey to insidious Jedi Mind Tricks?

However, once you go down this logic path, you will quickly see that no one is to blame, ever, for anything - because there's always a precedent. 

That's not a viable way to move in this world, however, so the opposite has become true: You're responsible for everything, regardless of circumstance.

Hence, bad trooper!