If you leave a building unattended for any length of time, it will be entered and searched by someone. Kids, the homeless, druggies, vandals, someone.
Being unattended and having signs of not being inhabited to a large degree is what piques the curiosity of other humans who should know better - but decide to do it anyway. And its been that way from day one.
Owners assuming that their property will be respected and no one will enter into it are eventually disabused of the notion. Children are actually the worst at it - they have yet to mature and their risk assessment doesn't work well. Being largely amoral and requiring adult supervision means if you let them free range, they will eventually go too far. Single moms are definitely handicapped in that regard. Adult male supervision may have a price, but correctly exercised the child will grow up to be a functioning member of society.
Leave your cabin locked up, make it from stone, add steel bars, whatever. It's gonna be broken into - sometime - same as a car or truck, even when parked right outside.
If that sounds reasonable, then expect that to be the "reasonable man" interpretation used in court. If that sounds unreasonable - ok. But I recognize that most who consider it unreasonable also lock things up and keep guns out of sight, too. So the concept is still acknowledged.
Humans trespass and enter buildings unless you have a live person there to stop it. Otherwise, plan on it getting broken into, and please don't be surprised when it happens. It will.