To be clear, that foolishness is for the twitter post, not for you. The difference is not in level of maturity, it's in nihilism vs optimism and yes the difference is literally ONLY in demographic/personal preference. Weather it is made for kids or adults doesn't make any inherent difference because material made for kids CAN still include all those concepts and vice versa. Ironically enough they more often then not treat it more maturely than material made for adults, which usually use it for pure shock value and nothing else. Obviously I think people know by now, my preference leans more towards the optimistic side of the spectrum BUT IMO the best kinds of stories are the ones that struck a good balance between optimism and nihilism. You can have both IMO, it's often very interesting when the perspectives clash. But like what you like I guess.