Question

In his research, the ethnographer richard mitchell kept his identity a secret while studying militant survivalist groups. sometimes he even presented himself as a believer in the survivalists’ paranoid, racist ideologies. by engaging in such covert research, with what was mitchell concerned

Answer 1

The answer to this question is Rapport
It's been a common knowledge among ethnographer to know that no matter which culture you're in, people will be a lot friendly to you if they see similarities between you and them. Therefore, mitchell strategy to support other culture's ideologies is understandable to ensure his safety.