I'm very much on the police's side here; it's a case of they're damned if they do, and damned if they don't. Invasion of privacy by the police? I'd want them telling me about gaps in my defences! Invasion by burglary is ten times bigger.
It's very easy to take the view "burglary will never happen to me". Until it does.
Someone who grew up in a "nice" area where everyone leaves their doors open who then moves to a rougher area is in for a shock. In the habit of visiting the village newsagents on your bike for a paper? In a different area, that bike would be gone in thirty seconds.
Leaflet delivery people? Apart from the fact that many of us despise junk through our doors, it wouldn't surprise me at all if some of them also have the duty of quietly trying door handles on their rounds, noting which ones open easily.
Some professional thieves tour "nice" areas; firstly because that's where the money is, and secondly because they know everyone thinks "crime never happens here". Some of them sit in parked cars, to observe people's habits and routines.
Cars used to be stolen a lot, because it was easy to "hotwire" them if you knew how. Nowadays, it's much harder, so there is less car theft these days. If we all made it harder for burglars, there would be less of that, too.
Yes, it's sad that we have to be so defensive, and in an ideal world, people would respect each other's property. The police are demonised all the time for many things, yet here they are actually trying to help.