First, though, let's look at the spell itself:
Charm Person: This spell applies to all two-legged, generally mammalian figures near to or less than man-size, excluding all monsters in the "Undead" class but including Sprites, Pixies, Nixies, Kobolds, Goblins, Orcs, Hobgoblins, and Gnolls. If the spell is successful it will cause the charmed entity to come completely under the influence of the Magic-User until such time as the "charm" is dispelled (Dispel Magic). Range 12". (M&M, 23)The key word, here, I see is "completely." Completely under the influence, the spell reads. While what exactly that influence entails is unexplained here, it is not partial in any way.
Let us now move on to the potion of human control in Monsters & Treasure:
Human Control: This potion has generally the same effect as a Charm Person spell, but it can effect from 1-12 persons with 3 or fewer Hit Dice, 2-8 with 4-6 Hit Dice, 1-4 with 7-9 Hit Dice, and 1 with 10 or more Hit Dice. Saving Throws are applicable. (M&T, 32)As you can see, the potion of human control mimics the affect of a Charm Person spell, but allows control of a greater number of persons. In a similar manner, the potion of giant control makes reference to the Charm Monster spell, and the potion of undead control to the Charm Animal spell.
The final bit of clarification comes from the ring of Mammal Control, which reads:
Mammal Control: The ring allows the wearer to control from 3-18 small mammals or from 1-8 large mammals. This does not consider any creatures listed on the Monster Reference Table. Control is complete, even to having the controlled mammals attack the others with it which are not controlled. Range is 6". (M&T, 33)The question is, really, does the Charm Person spell work like the ring of mammal control, even to the extent of forcing the charmed person to attack its allies? Seeing as Human Control is (basically) the same affect as Charm Person, and Human Control should mimic the general guidelines of Mammal Control, I would say yes, based on my reading of the following passages.
But since others seem to have different opinions on the subject, what am I missing?