It isn't. If I may be perfectly honest (and speak entirely for myself, not representing XSEED in even the remotest way), I'd prefer there exist no ratings board whatsoever, that no platform-holder ever turned down any game for any reason, and that no content was ever denied from existing in any work of art, no matter how reprehensible it may be.
In other words, I hope one day for complete, worldwide artistic anarchy.
I don't believe any art should ever be considered taboo, nor that anyone -- regardless of age or sensitivity -- should ever be restricted from viewing any work of art.
I believe that the mere existence of taboos is what causes most of society's problems -- if we were completely frank and open and exposed everyone to every aspect of the human condition from the very day they could learn to comprehend it all, I firmly believe the world would be a better place. Half of all crime is spawned by those who know they're doing something "naughty" or "forbidden" and get a rush from doing so... but if nothing were naughty or forbidden or taboo, there would be no rush, and therefore -- in my own armchair philosophy, at least -- there would be less inclination to commit crimes.
I know this is entirely impractical, but I am an idealist of sorts, and I will continue to do everything in my power to work toward this ideal of a world in which, quite literally, nothing is sacred.
-Tom