Talk nonsense much? Atlus' last two releases on 3DS were both M rated (Shin Megami Tensei IV, and Devil Summoner: Soul Hackers. Just because the Mario titles don't contain those themes (they're not supposed to, duh!) doesn't mean Nintendo doesn't allow it on their consoles.
And the gaming world could use more games at the quality level of Fire Emblem:
Metacritic - 92 %
User Score - 9.2
And, where are you getting that Atlus has much deeper ties with Sony? Of the 189 Atlus titles to sell a minimum of 10,000 copies, 74 were for Sony platforms, while 88 were for Nintendo platforms. Meanwhile, Nintendo and Atlus are currently working on a Shin Megami Tensei /Fire Emblem crossover game. So, where do you get Sony having MUCH deeper ties to Atlus? Because you want it to be true?