@Sheikah's analogy was pretty spot on (his last quetion in his post was unnecessary, but that's none of my concern), but let's use a recent example.
Even with parental controls, blocks, PEGI ratings kids will still play Bayonetta even if they shouldn't.
Also...nobody cares for the media in that regard (i.e. video games/parental controls). It's just paranoid parents who eat up articles about this kind of stuff.
It just isn't a good reason to not include Party Chat/voice chat. People want it, even if it's just to see that Nintendo is capable of moving with (past) times. This is actually why I want to see Party Chat on a Nintendo console: To be sure that Nintendo isn't ignorant of current trends in gaming/social gaming.