Here's an ethical question for all of you. Is it good to brainwash other people?
The answer is "no" because it negates their free will. But let's consider it in terms of yesterday's episode of Josie and the Pussycats in Outer Space. In the episode, they brainwashed the villain into being nice. That's a classic example of the ends justifying the means; our heroes thought brainwashing was okay, because it had a good result.
For a real life example, consider people in prisons who are forced to take pills which make them less violent and more docile. That's not brainwashing per se, but it's forcing someone's behavior to change. The scary part is that the pills work, even if the person taking the pills is completely against the idea of changing their behavior.
More commonly, you see pills like these given to children with ADD, to make them calm down so it's easier for them to pay attention in school. It's the same idea; you give people pills, and they become more docile, whether they want to or not.
It's similar to brainwashing, because you are controlling how other people behave. It's not as direct as brainwashing, obviously, but I still question the ethics behind it.