A person who only believes in the signalling value of green technologies (hybrids are trendy) does not want a social policy mandating green behavior (the behaviors would lose their signaling value.)

A social policy mandating a behavior that is typical of a subgroup shows that that subgroup wields a lot of political power and thus gives it higher status - those pesky blues will have to learn who's the boss! Hence headscarves forbidden or compulsory, recycling, "in God we trust" as a motto, etc.