On the third hand, they're not computers that always come up with the logical option. They're living beings filled with hate and rage. They won't be doing the same logical choice all the time.
I never said a thing about logic. Logical thought allows for alternative possibilities. Dalek thought is
fanatical, and fanatical minds are extremely narrow and rigid. And since Daleks kill off anyone who doesn't conform exactly, they'd end up being a whole bunch of fanatical rage maniacs who pretty uniformly agree about how to act out their rage -- basically a permanent floating lynch mob. When the single overriding thought in every Dalek's mind is "EXTERMINATE EVERYONE EXCEPT US," there's not going to be a lot to disagree about.