If all we do is part of god's "Master Plan", then by definition, anything we do is what God wanted us to do. Hell could only, by definition, be part of god's Master Plan, which would be in line with Calvin's predestination. We would therefore be punished for doing exactly what we were supposed to do, because we cannot act contrary to the Master Plan, else we would introduce a paradox.
So, if the Master Plan allows for us to make real and essentially random choices when they present themselves to us, it is either a plan with obvious flaws which we are punished for acting upon, or else we are deluded by believing we have legitimately free will.
So, if the Master Plan allows for us to make real and essentially random choices when they present themselves to us, it is either a plan with obvious flaws which we are punished for acting upon, or else we are deluded by believing we have legitimately free will.