It's a sad shame, but there are people that really abuse sick leave and the rest of us have to pay for it. That is one (very popular) way to look at the world.

It's a sad shame, but there are people that really abuse sick leave and the rest of us have to pay for it. That is one (very popular) way to look at the world. Alternatively, we could accept a certain amount of abuse in order to make sure that good folks get what they deserve.