because they selected people who will basically enjoy any loud, ridiculous thing thrown at them? because the energy of the room will get people to overreact at things they generally would find mundane or outright annoying in any other more traditional setting? Bethesda isn't going to select "vanilla purists" for their audience, they're going to select whomever is going to give their reveals the biggest reactions.
the point is, you're extrapolating a very small selection of people (hundreds at best, discounting press, Bethesda employees, and family/friends) into what the "public" feels about the game. that's just not a logical leap to make.