Liberals hate big oil and they hate private corporations who strive to make the hated profits that have made this the most wealthy and comfortable nation in the world. And most significantly, liberals know that corporations and corporate leaders are held to an infinitely higher standard of conduct, behavior and accomplish than are government employees. Private company CEOs are easier to punish than any government official (that’s why Bill and Hillary are still walking around polluting the air with their very existence and enjoying freedom instead of a prison cell). Therefore, liberals are reluctant to have the successful Tillerson in a government position that has traditionally been beyond criticism and beyond removal from office.
What makes liberals mad is that when Rex Tillerson becomes Secretary of State they will have a much harder time trying to get him into trouble than when he ran Exxon; firing and removing the CEO of an evil oil company for pollution under the lie of warming/change is easier than anything facing a Secretary of State (Hillary was a liar, a leaker of government secrets, a money launderer, an influence peddler, was under FBI investigation for a very long period of time, yet she kept her SecState job with honors and praise for her persistence).
What Democrat liberals fear most is that Tillerson, being the excellent and accomplished negotiator he is, will convince our allies, and probably our enemies as well, that warming/change is a lie and a scam and cause this phony crisis to be opposed by more nations around the world as the fraud it is.