There are plenty of non-obvious reasons someone may need to take a sick day - bladder infection, migraine, mental health issue, etc.
I’m in agreement with SatNav and TastyR on this one - I would prefer if people stay home when they are sick. I do, and I find I recover much faster when I take 2-3 days off to rest and nap on the couch vs dragging myself into the office.
I had one coworker who was absolutely terrible about coming in when she was sick - one year she traveled overseas and brought something back with her, and came into the office with it, despite being told not to. Within a week, it was making its way through the office - I have never before seen something take out so many people at once. At one point we had literally half of our 30 person office all out sick at the same time. I was one of about 3 people who somehow escaped unscathed. It was knocking people right out too - many people who got it ended up bedridden for days they were so sick.
This was in late 2019. Many of us now wonder if it might have been an outbreak of covid before covid was being properly recognized.