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How to explain that I do not want to visit a country due to personal safety concern?

I have been invited to visit a professor in a different country. I am very reluctant to go. The government of this country is currently under investigation by the UN for suspicions of crimes against humanity targeted at people of the same ethnic background as me. More generally, people from my ethnic background are legally considered second-class citizens (when they are citizens at all) in this country, and routinely get physically aggressed in the street without the police or army doing anything, even partaking sometimes...

How should I explain to this professor that I do not want to go? Should I get into details, invent a different reason?