It's not an exact parallel, but whenever I see this sort of topic come up it reminds me of the 90's debate over first-person shooter games. At the end of the day it's fiction, and the vast majority of people know the difference between shooting fictional characters and real people, and the difference between finding anime teens attractive and real-life teens attractive. There's a distinct disconnect between what people like in fiction and what they like in reality, I don't think shooting games would be popular if players felt like they were killing actual people, since most people would be extremely unsettled by that. Likewise, I don't think finding anime teens attractive is in any way comparable to finding real teens attractive, especially since no one in real life looks or acts like an anime character.