Curiosity, are you for real? I only ask because your post sounds suspiciously like a troll post.
Obviously, you don’t know any actual teachers, because otherwise you wouldn’t be saying things like “go home at 3:00.” The teachers I know do not leave right away – many of them stay late to tutor kids that need help, attend staff meetings, and so on. And even if they do go home at 3, so what? Are you counting the unpaid time they put in at home grading and correcting papers, planning lessons, and making phone calls to parents about how their little angels misbehave in class, or are not doing homework, or are failing the class.
I’d say the teachers deserve a vacation just for putting up with the rude and misbehaving kids.