What if you infect someone on your way back?

You’re still in a much better position than we are today, where you’d infect several people in the store, and again the next day, and the next.

I'm weirded out by this binary thinking arguing against masks or testing. It's like the people who say that helmets don't prevent all injuries, which they conclude means one shouldn't be wearing one. Except that where helmets are only individual protection, measures against infection are affective at a population level, where you profit from others' actions.