Sadistically seductive

サディスティックな誘惑

These days I am obsessed by a theme that was posed by Dostoevsky back in his day and which I read in an article on the web:

And why are you so firmly, so triumphantly, convinced that only the normal and the positive - in other words, only what is conducive to welfare - is for the advantage of man? Is not reason in error as regards advantage? Does not man…