Generally speaking people don't enjoy the suffering of others even if they have somehow caused it.When people enjoy the suffering of others it is because they are not very well off themselves.Usually they tend to ethisize they joy of seeing others suffering(e.g with moral superiority etc).Do you think that those who enjoy the religious punishment of people or animals are having a great life?I will give you an example.During middle ages burning a cat for religious reasons was considered highly entertaining in france[1]( probably by people who weren't very well off which was most of the people).I have passed from the transition myself and perhaps i overgeneralize this reason..
1.https://en.wikipedia.org/wiki/Cat-burning