In fact, those things do exist but you will find that being viewed as the "ideal Japanese" is more important to Japanese people than their wellbeing. Take for example, the government has put in place a law/rule that says that workers should only work a certain amount of hours within a certain time and you will find that many Japanese find ways to beat this. Some clock in at a later time than when they actually arrive at work and clock out earlier than they actually leave work. So at the end of the day, this is more of a culture thing than even having laws or unions.