Fewer jobs call for physical strength. Instead jobs require brainpower and personal skills,placing men and woman on equal footing. Machines produce the goods.
The right answer is the third one: the bubonic plague originated in the Gobi Desert, part of the then Mongol Empire, around 1320. It then propagated to China and subsequently to India, Europe and Russia. The disease spread via trade routes mainly as a result of a poor hygiene. It never reached the American continent or Sub-Saharan Africa.
The simple answer to your complex question is NO. This is assuming that you live in a country where there are good laws (remember that history is full of bad governments that implemented bad laws) and that law enforcement is effective. Simplisticly, you should only ask yourself this question when your or your families life is being threatened and law enforcement is not around. Your response must still be within the constraints of your laws or you will find yourself in hot water. I'm not even going to try to discuss the ethics and morals that can apply as the situation can vary immensely. Keep it simple - don't operate outside the law, rather fight against unjust laws.
Answer:
I would say because they had no way to preserve them other than to pass them on to their kids, think about it I am certain most slave owners couldn't have care less about their slaves songs, they had no reason to preserve them.