Well that's true, good point. At the same time though do you think Sasuke would have thought to attack the village had Obito not told him about the truths of Itachi's past?Everyone is influenced by others.Naruto with Kakashi,and Jiraiya,people with their friends,but that deosn't make them manipulated by others.Sasuke decided to Orochimaru for power,then got rid of him as soon as he was done using him.Orochimaru didn't have any sort of God control over him.Sasuke never even respected him same for Obito.He gave no schitts when Obito died,and easily dispose of Orochimaru once he was done with him.
And also consider, even Itachi reffered to sasuke as a blank canvas, which can be interpreted in many ways, but from what I can understand he basically means that Sasuke is pretty easily led around. although this has never stopped him from having his own intentions and what not.