The only rational explanation for the Mario games is that it's all an opium dream.
Either that or Mario and Bowser are secretly friends and the constant kidnapping of the Princess is all about setting Mario up to be the hero so he can get the girl... but he's so pathetic that he screws up, leading to another kidnapping and the ever growing romance between the Princess and Bowser, who are obviously totally into each other. The princess is insanely powerful but never puts up a fight. I think she's hoping that Mario freak doesn't come along so she can spend more time with her true love.
Either that or Mario and Bowser are secretly friends and the constant kidnapping of the Princess is all about setting Mario up to be the hero so he can get the girl... but he's so pathetic that he screws up, leading to another kidnapping and the ever growing romance between the Princess and Bowser, who are obviously totally into each other. The princess is insanely powerful but never puts up a fight. I think she's hoping that Mario freak doesn't come along so she can spend more time with her true love.