It's a mind-control game - a dominant main character is not only expected, but desired. After all, the point of mind control is that it's the epitome of a power fantasy. Putting the MC into submissive positions (physically or socially) would disappoint or outright anger the vast majority of players.
That being said, the main character isn't overbearing or dominant with everyone - he is generally sweet to Alice and any kids you have, and tends not to throw his weight around unless the situation requires it. He's dominant, but that's not his goal - merely a necessary (and somewhat ingrained) attitude in pursuit of his actual target.
But at the end of the day, yes. It's a mind control game. He's going to be in charge ;)