Where possible, otherwise it will protect the players and staff with constant testing. A 20 minute saliva test is due out soon, once that is available and produced en masse then they can test them every hour if they wish.
22 fully tested players is less risk that a supermarket where 1,000 untested people could realistically pass through in a day handling all sorts of stuff.
Put it into perspective, it's a very low risk and regardless of this will only go ahead when the scientists and government say it's safe. Once they do the debate is over.