Define "rational". If you mean "Can someone justify those beliefs to themselves through a logical chain, while allowing for personal belief systems", then yes,

Define "rational". If you mean "Can someone justify those beliefs to themselves through a logical chain, while allowing for personal belief systems", then yes, of course, there are plenty of non-evil reasons a rational person could hold those. However, you can still have irreconcilable differences in belief systems at an existential level.