Five points to make, the first two I believe have already been covered:
1. Pretty clear sign that the people complaining still have the stigma of video games being an inferior medium of storytelling.
2. There are games that have the potential for far worse things - where you potentially play the abuser, no less. Those that are complaining may have complained about those, or about games in general being capable of that. In that case, good on them - they are at least persistent in their morals. If not, then... Well.. It shows a lack of truly caring on their part, and simply wanting to seem "in the right" to those around them, without actually having to put in the effort.
3. David Cage and the rest of Quantic Dream knew this would happen. Well, perhaps David Cage didn't see it, since he's a bit... off-his-rocker, to say the least. But no doubt there were some people at Quantic Dream saw who this scene of abuse being in the trailer to be shown to millions of people, and said "yes. This will get people talking." And talk people did. And sales are more likely to go up rather than down as a result of this, although it is fairly far away from the actual release date.
4: You have to admit it is a bit insensitive to put this situation in the light of "check out our intricate map of decisions! Wowzas!" Not enough to pull the game from shelves or anything ridiculous like that, but... In a trailer? A bit distasteful, although they probably already knew it would stir controversy. That's likely why they did it.
5. Calling them "mega loser pussy jerks" wouldn't really help to convince them, if they were reading what you have to say. Just be careful about that moving forward, if you have any intent of changing people's minds. We already more-or-less agree with you on this forum, but preaching to the choir doesn't really change things. Then again, you're probably just intending to vent, which is understandable.