No, they are using a benefit agreed to in negotiations. Now, other work groups may be exceeding their qouta.
Sick time is negotiated so you will be paid when you are sick. Not to be used anytime you want to go to the lake. At that point, not only are they paying you, but the person who has to cover your shift.
That hurts my profit sharing. If you are sick, use it. If not, go to work.