I didn't ask my landlord to look after DS, I didn't say 'hey, I'm running outside, can you listen for DS?' He did see me in the hall and I said 'I'm just moving our car quickly.' I know he wouldn't have gone up if DS was crying, unless it was going on for ages and he worried that maybe I hadn't come back. But he's very conscious of making sure he doesn't invade our privacy. Obviously if there was a fire or he heard unusual noises he would investigate or run up.
But the scenario of a woman locking her door and walking away to compose herself is the same thing, a woman doing that would probably have an eye on her house the whole time.
My point is, none of us are perfect. And aside from something like driving to the shops while your baby sleeps (which everyone in this thread has agreed was a huge no-no) most would have a reasonable explanation for a choice they made and everyone needs to put their judgey pants away.