Shock of cultures. Never forget that white people moral on sex is from judeo-christian religions. Americans specifically couldn't stop sucking Luther's cock, a dude who proclaimed that the sole act of masturbation was enough to send you to hell. Japan never was under the spell of the judeo-christian culture, when colons arrived they killed them or banished them.
This is why there is such a difference between japan and white people countries when it come to moral which in the end is nothing but a human-made opinion enforced on another. Nietzsche wrote a lot about that (
https://en.wikipedia.org/wiki/On_the_Genealogy_of_Morality )
today people who are saying that lolicon is necessary bad are brainwashed by thousand years old religions. it's amazing when you think about it.