The fact these tapes were "disturbing" and "not okay" was pretty much Kojima's plan. Sure you can go on your way saying "MGS shouldn't be taken seriously!" or "This is child porn for having a 13 year old on a 20+ year old!" But this is what Skullface did. And just shows how horrible he is. And is enough of a reason to kick his ugly ass in Phantom Pain.
War is ugly.