They are just looking out for signs of activity to assure them that all is well.
Let me explain about Mr Cranky. He was a recluse and a miser whose only interaction with his neighbours was to fight with them.
Consequently he had no friends except for some old war buddies.
One day my next door neighbour spoke to me because she noticed that his porch light had been on continuously for three days and she was worried about him. I went over and knocked on his door front and back but couldn't get a response. Then we decided to ring the local hospital. We only knew him as Keith and had to look at the mail in his letter box to find our his last name.
Sure enough, he was in hospital and we went there to see if he needed anything. That was the beginning of our connection but it was my observant (Christian as in Catholic) neighbour who sounded the alarm. I would hate it if a neighbour died at home and no-one noticed for months.
This was not the first time we had kept an eye on an elderly man living alone. One of the members of our church was a recluse in that no-one was ever allowed to cross his threshold but he was a regular attender at church. He went missing and we were worried about him. We checked his house and called the police who entered the house and since he wasn't dead inside they declared it a missing persons case and told us to report it officially. By chance I thought to ring the hospital, and sure enough he was there. He had suffered a psychotic episode and had nothing with him - no pajamas, no shaver, not even a tooth brush.
The state of the house was unbelievable. It took a team of about 8 of us five days to make it habitable again. He was discharged but was zombie-like from the meds. We set up a roster of people to ring him every day to see how he was and I called in often. He trusted me and I was allowed inside.
He disappeared a second time and we again had to track him down. Again he was in the hospital, having had a fall down at the shops. I was very angry this time because the social worker at the hospital now knew that he had a support team from the church, a niece in Queensland who cared about him and they also knew the contact details of his doctor, but no attempt had been made to notify anyone of his whereabouts. The poor old boy was very vulnerable and had no-one locally available to check that he was OK. Luckily, he had us, the ones who have learned the lesson of the sheep and the goats (Matt Ch 36).