It's an interesting topic, which is misunderstood thanks to people more often than not giving a wrong explanation. Now, most of us don't actually wish a player to get injured, they wish the opponents to lose an advantage. So, once they lose a key player I am happy. Ideally, it would be to a red card and not to an injury but i will take what i can get. It's the result that i'm happy about not the individual being injured. Also, i don't care if the contest becomes less attractive or whatever, i'm not a neutral.
On the other hand, i can't feel bad for Karius. He doesn't need sympathy, he needs to toughen up and become better. Should we be sympathetic towards all footballers who will never play at a high level? All those thousands of players who play in the 2nd and 3rd and 4th divisions? How far does sympathy needs to go, before we feel good about ourselves?
TL
R - I do feel bad about injuries yet I am happy when Liverpool lose an advantage. Don't feel bad at all about Karius fumbling or Gerrard slipping. More of the same please.