Earlier quoted context omitted.
Because if you are a mangaka/anime artist, you'll be pressured to add otaku stuff to boost sales.
And then -- pedophile content is ok for you? Wow.
And anime throw wrenches by having people's apparent age being different than their actual age.
Take for example ReZero, where female heroine is 118 year old elf that looks like an average 17-18 year old, but has the same knowledge as a 12 year old human. This of course squicks out main protagonist who's about 17.
Even though by applying our social mores, he'd be in the right.
Different mores, different opinions. I honestly don't care too much about them. They are most often just stupid thing for Otakus to obsess about. And you are very fixated on pedo content, when the Otakus content is much, much broader see (and just as degenerate) - loli yuris, incest, BDSM, any combinations of previous, etc.
And these are just tips of the shitberg.