sounds fair enough, to me. Kinda like every other time this exact thing comes up. Artists are allowed to create what they want, and if they want to sell that art through a third party, the third party has the right to stipulate what it will and won't carry.
If Sony were arranging to have developers fined or imprisoned for impugning the rights of fictional characters,then I could see myself agreeing with the enraged, but as it is? If you're a publisher, you have the right to accept or reject whatever project you please, for whatever reason you please.
if you're a japanese game dev and you want your child groping minigame to remain intact, then just find a different publisher. Ditto if you're a consumer who desires the same. Morality aside, if there's a strong enough demand for something, there'll be someone willing to supply it.
Sony making this a global policy is certainly a new spin on this tired, tired internet argument, though. I have no opinion on it one way or the other, but it's rare to see such a sweeping reform enacted.