On this topic and those in general that push the buttons of PC hordes:
Any honest appraisal of any subject must by definition include any and all valid information, regardless of where that information may lead. I don't care what it is or where the research goes. If it is valid research, than honest inquiry directs it must be considered.
Anything less than that is dishonesty and ideological dogmatism and nothing more. You may as well bring back the Inquisition and ban all books that aren't in conformity to Church doctrine.