If you live in a place like Germany or France where the government legally mandates a non-trivial number of paid sick leave days (in Germany, it’s 6 weeks per year), I can understand this gripe. People who can realistically leave work when sick should.
But given your name, I bet you live in one of the few western nations that doesn’t have such a policy. Y’know, the fucking stupid one, where workers have the right to go to work, smile, and suck their employer’s cock. In that case, I have to ask - how’s your company’s paid sick leave policy? Do they:
A) Offer a generous number of paid sick leave days, guaranteeing that you will not be fired or otherwise penalized for using them
B) Do less than that
Because if it’s not A), nobody is going to take time off work for anything that doesn’t leave them flat on their ass. And I do mean every element of A) - anything less than that will incentivize people to come to work sick.
If the sick days aren’t paid, taking time off means less money in your pocket, and many people cannot afford that.
If the number is some pathetic crap like 10 days a year (the national average for full-time employees, and about 1/3rd of what everyone is mandated by law here in Germany - most people in the US don’t even get that), people are going to hoard that shit, in case a more serious illness or accident comes along, and go to work despite being potentially infectious.
If taking sick days leaves you penalized, nobody is going to want to take them.
If the company doesn’t make it clear that you will not be let go for taking those sick days, nobody is going to want to take them.
Now, maybe you got lucky and ended up in a job with really peachy (read: the kind of thing first-world countries have made legally mandatory) sick leave policies. But if you didn’t, don’t blame your coworkers. They have themselves to look after. Blame your boss for being a greedy shithead, and blame your government for refusing to institute common-sense labor policies that most of the rest of the world has. Oh, and for passing union-busting bullshit laws in many places.