Why were punishments in medieval Europe so harsh?

That was just the societal norm of things in those days. To them it would be strange to put someone in jail for their entire lives with plenty of food and living space. They would see us as to nice and caring to someone who has broken the law.

In those times the world was much harsher then our modern day. Yes, but crime was most likely much higher and much more common, especially in times of national crisis as wars and struggles for power were a lot more common nowadays countries are more internally occupied whereas in medieval europe it is very evident that many nations that are friends now were at war with one another at these times.