I do that too.
There is a catch-22, though. Some people can't afford to stay home sick. Some people just can't justify it in their heads. Some people are more susceptible to illness (due to immune systems, having children, using public transport) yet if they stayed home in order to avoid spreading illness when to do fall to germs, well, someone's gonna bitch!
When I came back on Tuesday I wouldn't touch anyone's paperwork if I was giving it back, and I didn't shake anyone's hand when I met them, explaining I'd been ill. Most people appreciate that. I was very careful, but so many people are not. This is evidenced by the state of the ladies rooms.