I believe the counter-argument to that would be that no act that is a result of mind control could be considered to be unequivocally good. The act of mind control itself is an inherent evil because it is forcing someone to do something they may not intrinsically desire without their consent. It's mental rape. Even in a scenario where the outcome is good, the ends wouldn't justify the means.

I'm not 100% sure how far this argument extends for me, but I find it generally more persuasive than the notion that "one good person" will be able to net more good than harm from the use of the power.