Some people can't afford to stay home.
Some people can be carriers and not even know that they are exposing others to sickness. So unfortunately, whether there are symptoms of illness or not, you can still catch something from someone.
Some people cave commitments that don't allow them to stay home even if they are sick.
Ok well a restaurant and things like that make sense. As far as the grocery store goes, some people don't have anyone to go for them. I go to the store when I'm sick to get medicine or soup, or whatever I need. I don't know your situation, but I don't have a spouse or any family who will do that for me and my friends usually are busy so they don't have time to run my errands when I'm sick.
I do have all that sh!t stocked up. I don't drive though, last year I was very sick and walked to the doctor and the drug store to get my prescriptions. I understand what you are saying and I do stay home as much as I can when I'm sick but there are times when people have to go out. I had the flu and called out of work when we were extremely busy and got an angry call from my boss that they needed me there. When I went in my boss ended up getting sick and then b!tched me out saying he should send me the doctor bills. Lol he's the one who told me I need to come in.
Yeah I hear ya. My job always wants people to come in sick, they don't care. I've seen them tell people to come in who were so sick they should've never been out at all. Then everyone gets mad because you're there when you're sick. It's damned if ya do damned if ya don't.