I was a member of that organization until I moved to Knoxville in 1987 and started attending chapter meetings where the primary activity discussed was how to stop various business developments and promote various forms of socialism. Then I dropped my membership. Sad, too, because the Sierra Club sponsored al lot of great outdoor and wilderness trips.
There is nothing wrong with wanting to protect nature. But they are radical extremists who do not believe in any “multi-use”compromise at all. Zero, they want to wipe the human species off the planet. But the true reason it exists is as a vehicle to usher in government power and communism, and launder money as they do it. Observations that display this fact is that most of what they push to have forced on people actually do more harm to the environment than help it. The true cause and effect is self explanatory once one digs into the true results of their agenda.