If you look at the the synonyms, it's clear that "brilliant" has strong positive connotations. And a lot of ethics are essentially recognizing that actions which might be rewarding in the short term are in the long term detrimental.
None was particularly effective as a military commander - which is something we should be grateful for, because if the Nazis had been ruled by someone with the military skills of Napoleon or Julius Caesar we'd all be fluent in German and xenophobia.
In fact they all did huge physical and psychological damage to their countries - something a genuinely brilliant political leader would have avoided.
I also think most of your phrases aren't things people would actually write, in that the adjective tone is dissonant with the noun. The one exception is evil genius, where I think the dissonance is the point.