It's not missing the point, it a matter of it not having the same weight in our eyes.
No, I wouldn't rather my child was with PS players. These days it's 6 in one hand half a dozen in the other. I'm way older than 9; I'm aware of *ahem* the stuff adults do among themselves but I still think current stuff in PS is going too far for a non sexual fantasy setting and relatively peaceful setting. Bad is not mitigated that much by the existence of worse. PS would really need to clean up before I would trust it to be suitable for children again.
I sense that there is a much more relaxed atmosphere regarding sex and violence in game.

However, holy moly morals aside, children really shouldn't be exposed to some of the stuff I've heard of happening in RPs these days, especially young children. And I worry that people might be so quick to get to the sex that they don't even bother to check if the other player is at least at the age of consent. Never mind all the complex problems that come with that one issue.
Simply put: Parents and children should share experiences. But, some RPs present unsuitable experiences that should not shared. That far out weighs, in my opinion, any good that can be gained from playing PS with a child. And the fact that there are worse places is immaterial, as I'd be horrified enough to find my child was involved in a rape and torture RP on PS.
I think Sillamon is using ratings as a common reference point, not as what it actually details. We all know what is meant by G rating and I believe that is the more important rating to understand. It's all about what is suitable for even young audiences.
Should the restrictions on language be kicked down from pg-13 to G so that its suitable for everyone?
I think so and . But, this is not just a matter of being too sensitive. However, if the Devs don't mind the possibility of fielding a lawsuit then fine. Keep in mind though, that yes the player takes on responsibility for their experiences in playing the game but, lack of more attempts at regulation, words alone are not enough, could present problems down the road. If they don't put out more prominent warnings that this kind of content isn't regulated (and no, not everywhere connected to the internet is lawless on this matter) they could be hurting later. Especially as this project isn't generating revenue. Keep in mind there is a reason other games have more stringent chat filters.

Darn, here I go starting to care about the game again... Never mind, if the game goes down behind a lawsuit then whatever...
*goes back to lurking*