“he quit because Greenpeace had been hijacked by the left”
John Coleman says the same thing about The Weather Channel, except he didn’t name the hijackers.
And David Horowitz says that about the Democrat Party in his book
“The Shadow Party: How the Democrat Party Was Hijacked by George Soros, Hillary Clinton and the Sixties Leftists (Amazon - co-authored by Richard Poe)
Because he is willing to name names and call these people out, he is hated I am sure, just as Carry_Oki says.