For the non-dualist the error of falling into monism, especially in the form of idealism or mentalism, is both more tempting and more severe than giving way to some form of dualism. Monism is a privileging of, or clinging to, the subject when what needs to be seen is the mutual inexistence of subject and object. Similarly, between nihilism and 'something'-ism it is the former that is the greater trap. The purpose of double negation is simply to destroy thought, to puncture thought-built worlds, and not to establish some new and glamourously paradoxical basis for belief. The peril is in what you believe because it is so mercurial, not in what you can't  or won't believe. There are so many reasons why you'd like to have a basis; it seems to be essential to any sort of action, and action is solace, but only when it is unashamedly dualist. So follow duality where it leads and be deaf to the siren-song of one-ness.