Two problems here. The most fundamental problem is that we are talking (in this instance) about belief systems. People seem programmed to reject even positive

Two problems here. The most fundamental problem is that we are talking (in this instance) about belief systems. People seem programmed to reject even positive evidence that conflicts with their belief systems - just as they ignore the complete absence of evidence supporting things like religious faiths, fairies at the bottom of the garden etc. The second problem is that very few of us are taught how to assess evidence. Most lack the skills required to judge the relevance and likely accuracy of what is presented. Evidence (I know) to support this hypothesis can be gleaned from almost any daily newspaper - most items are written by intelligent human beings but the results lack any analysis that reflects an ability to process evidence properly.