You don't really need blood or gore to be adult. Most of Nintendo's Switch games are all designed and marketed with adults in mind. 

i agree, my favorites like mario and zelda. i didnt mean it in a negative way.

No. Otherwise, they wouldn't have had voice chat in other Wii U games like Mario Kart 8 or Smash for Wii U, or even the DS/3DS Pokemon games. Let's face it Nintendo would've implemented some form of Voice Chat in Splatoon if they wanted to, but they didn't. 

Do you see the question that was asked for that poll?

"How old is the person in your household which has the strongest desire to purchase a Nintendo Switch?"

Do you see the verb being used there? It's not own a Switch. It's not play a Switch. It's purchase a Switch.

I hope you're intelligent enough to figure out how that just might skew demographic data a bit.

Only this isn't baseless, Nintendo said it themselves. Takahashi said this. 

"Everyone has a smartphone, after all, and they’re very convenient. So instead of fighting with them, we’ve chosen to make friends with them. We’ve also made Super Mario Run and Fire Emblem Heroes. For the Switch, we’re focusing on convenience with smartphone use. So we’re taking into consideration the ways in which they would be used to support games by examining whether existing applications are suitable, or whether we need to create something completely new."

The decision was made because of the convince of Smartphones. If this really was about protecting kids, they would've come out and say that or at least, it would be much more obvious than it is. Nintendo was forced to take down Swapnote on their behalf because that indecent could've gotten them into much further trouble if something wasn't done. Swapnote was latter re-introduced as Swapdoddle with all its original messaging features, so It's not like Nintendo is against messaging friends.