I would be more likely to sympathize with JSO if they engaged in direct action against the oil industry instead of the general public. Stopping ambulances and electric cars in traffic does not get the world to abandon oil.
If you’re going to commit a criminal offense regardless, at least target something that actively supports or benefits from the oil industry. They could go full Robin Hood, robbing businesses that support the oil industry and anonymously donating the proceeds to environmental causes. They could threaten car dealerships that sell ICE vehicles. While it is certainly illegal to burn down a gas station, at least that would be an attack on the object of their protests rather than the general public.
Nothing wrong with their stated cause, but their actions don’t support that cause.