None of them are benign. He's the only one to have been in a government office though, and he's also batshit crazy, which makes him even more dangerous than the other oligarchs.
He is not "batshit crazy", or maybe he is. But he is making the next generation of ICBMs for the US government, sorry.. he is making super-duper rockets that will definitely take people to Mars and his companies/creations will be the very first tech ever to _not_ be used for war and death!!! (he wrote while laughing). So that settles it (all).