Because they are selfish arseholes is the most likely answer.
Seriously, why are we even bothering with this lockdown? When people do *smile* like this it is almost pointless for the rest of us to do the right thing. We will never contain this thing whilst selfish pricks continue to do the wrong thing. We might as well get on with our lives as we used to and let the virus sort us out.
But I guess the point is why are they going to work. Part of its them being selfish (because they know they are positive, even just looking after their co-workers, why go to work), but surely they have been told or read that they can receive the $1500 payment. I assume when those calls come from the contact tracers, they should be re-iterating this to those that turned positive.
Ie. 1st you tell them they are positive
2nd you find out where they have been and who they potentially came into contact with
3rd remind them of their obligations to remain at home including those who live in their household
4th notify them of their ability to access the government payments
It should be the same at the testing stations, they should be notifying people of the $300 that is available to them.
I am assuming this is what goes on, but I don't know as I haven't received one of those calls.