Yes - it's more about the neighborhood.
We also haven't had a break in in the 20 years we've owned the house... - and we have never locked the doors.
I don't worry about the boat either. The keys are in the ignition if anyone wants to take it for a spin. So far, there have been no takers.
If I lived in a place where people could not be trusted, I'd invest in a new neighborhood, rather than alarms, locks and weapons.
But you live in Australia. You have no crime. In the USA, we have a significant portion of the population that thinks the government should support them and when it doesn't support them to their level of satisfaction, they steal.
In all but the smallest of cities, neighborhoods degrade over time as the more well to do folks move out to newer neighborhoods and the less well to do move in. If you live in a city and stay in your family home into your seventies or eighties, there's a good chance you're now living in the "hood" (US slang for ghetto).
Back to the boat, When we cruise, we sometimes end up in nice marinas, outside of the cities and or with good security systems, self closing gates, card access, even security staff. On the other hand, we will sometimes end up at a city owned marina or dock in the old riverfront section of town.
Here, you had better lock everything that can be locked and remove or cover everything else. It's a shame, but many folks who believe society has been unfair to them look at us as rich and part of their problem because we own a boat. And some don't think it's wrong to try to even things out by transferring some of our wealth to them.
It's going to be pretty hard to rig cameras to cover our boats while we are traveling and of course if they are obvious, the thieves will probably take the cameras as well.