You've heard the say that terrorists only have to win once, while decent people have to win every time? If the terrorists' (aka as 'leftists') plan involves a long series of mild 'nudges' in the direction of their overall goal, then those mild victories cumulatively result in a massive shift in social acceptance and the realization of their end goal, which is legalizing sex between children and adults, and the casting off of any limits or boundaries of sexual activity. It is Caligula writ-large. They want pure, unadulterated hedonism.