I personally think that faith is for those not yet equipped emotionally and mentally to deal with reality.
Or maybe reason (or materialist reductionism) is for people who want to escape from the multifaceted and indeterminate nature of reality. It's ironic that it is the same impulse for certainty and definitive answers that drives people into JWs as also drives many former JWs to embrace reductive materialism. It's the same sort of myopia, just different wallpaper.