The "monster" of realpolitik Henry Kissinger had hard words of truth for will-good liberals who despite their professed beliefs in "equality" demand and expect to keep on sucking the tit of realpolitik imperialist USA delivered by "bad guys" like Kissinger. Zerzan says that Kissingers challenge to liberal consumers can only be answered ethically and rationally by what then became known as "anarcho-primitivism". I have my disagreements with Zerzan, but his Kissinger story delivers the point well.
As for "spirituality", science speaks of theory of mind (http://en.wikipedia.org/wiki/Theory_of_mind), which in some sense is projecting. The difference of animistic and shamanistic world views is that theory of mind is applied to the whole of cosmos, but in materialistic approach the logical conclusion is eliminative materialism (http://en.wikipedia.org/wiki/Eliminative_materialism). The question may or may not be unprovable, but certainly there is little if any evidence that is undeniable... but if you allow ethical considerations to mix with the equation, it seems very natural that even keeping the door open to animism and panpsychism as possibilities worth keeping in mind, and at least potentially extending theory of mind to whole of cosmos, will make a difference on how you act towards your environment. There is a world of difference considering (allmost) everything lifeless matter and just resources for your consumption and seeing some aspect of awareness and sentience in all parts of universe, with intrinsic value and dignity.