Actually, he's against the proposed tunnel to be put through Mt. Takao, but he's also sharing the stage during the 3/11 nuclear power protest in Inokashira Park.
Small wonder that yokai would be against nuclear power. Shigeru Mizuki often ties their decline to the spread of electrical lighting in Japan, and there were widespread rumors of tanuki and kitsune attempting to derail trains when the first lines were put down in the 19th century. As the protester's sign above says, "the Tengu won't forgive anyone who destroys the environment."