The point of control groups is, in effect, to not have to have the conversation we are having. It is incredibly glarring to have such uncontrolled differences b

The point of control groups is, in effect, to not have to have the conversation we are having. It is incredibly glarring to have such uncontrolled differences between the two groups. I personally tend to believe the results are "correct" and "logical" and "expected", but this belief of mine is how confirmation bias works, hence I can not relly on this experiment exactly because of the reasons OP mentioned.