You have a fundamental misunderstanding of transit activists if you think that’s what they want. The meaning behind Fuck Cars is that we have harmed and destroyed so much of the world, our cities, our cultures, and our quality of life for the sole benefit of the private car industry. Obviously trucks have their uses in agriculture, construction, etc., but they have no business being driven through heavily populated neighborhoods. Cars should be a tiny fraction of the world’s modes of transport and instead it’s often the first and only option.