Sad over Trump's decision

Ace, among others, collects the unhappy reactions to President Trump's decision to withdraw the United States from the Paris Climate Accord.
Logic optional.
This is a common signal from Progressive Messaging Central. The claim being made is that the Paris Accords are simultaneously an ineffectual nothingburger of meaningless symbolism, so why even bother withdrawing?, but also are The Only Thing That Will Keep the Earth from Literally Dying.
Obviously, these can't both be true at once: Either the Accords do something, or they do not do something. They cannot exist in a state of quantum indeterminacy where they remain in a mixed probabilistic waveform of both "doing something" and "doing nothing" until a Progressive Political Physicist takes a measurement of which state is most helpful for his Religious Fervor at this moment.