And Edward said "UrrrrPPPP!"
I would tend to believe that these type of manga like those other types I.E:tentacle rape and darker varieties are a small portion of the Maga Market.
Akin to a crudely drawn White power comic without the crudely drawn part, since there are more wannabe manga artists then actual jobs available. On only has to look that the vast arena of doshinji manga to know that that much talent searching for employement, would eventually get picked up by some of the darker sides of Japanese society, like the militarists.
This isn't the first time such a warning has been raised.
And now if you'll excuse me I'm going to photoshop "It's all Bush Fault" in place of the Kanji in the first picture.
By the way, Japanese draw manga as they see themselves, for those of you that wonder why all the characters don't have slanted eyes.
Just a quickie...