Isn't there also a shortage of masks because everyone's snapping them up and hoarding them? If people who're actually ill can't get a hold of any because of that then I'd argue they aren't even doing the right thing period.
The insidious thing about this virus is that people can be contagious for weeks before they notice symptoms.
Citation needed. The incubation period appears to be 2-7 days, with 14 day quarantines used mostly to give margin for error.