Is blocking traffic invalid then? Because that was also part of the civil disobedience used in the civil rights movement. Oh wait, they DID claim it invalid then, too!
“We do not need allies more devoted to order than to justice,” Martin Luther King, Jr. wrote in the spring of 1964, refusing calls from moderate Black and White leaders to condemn a planned highway “stall-in” to highlight systemic racism in New York City. “I hear a lot of talk these days about our direct action talk alienating former friends,” he added. “I would rather feel they are bringing to the surface latent prejudices that are already there. If our direct action programs alienate our friends … they never were really our friends.”
Well destroying the Earth does not in anyway benefit art, either, but we’re still doing that one.