Even if you don't fully trust them, it's still just a better way to live - if you have the luxury. I left money - change from a grocery run on my coffee table, and then had some friends over. It's not the remnants of a high trust society that let me not worry about that money being out, but financial privilege. That the < $100 wasn't worth my time to worry about. If one of my visitors took some/any/all of it, I wouldn't have gone hungry. I might not even have noticed. Just thought, huh, that's weird, and gone about my day. Others I know don't have that luxury, and would go hungry if it was their money that had gone missing. They're much less trusting, because they have to be.

If the latest shipment of crap from Amazon/Temu went missing. Annoying, but you'd just tell them the package got stolen and get a replacement sent out.

I live in US suburb and I also trust my neighbors. It's unlikely that my actual neighbors are stealing packages.

The problem is that there are people who drives through residential areas looking for packages to steal, cars to break into, etc. and that occurs quite frequently, as caught on our security camera.

It doesn't take many motorized perpetrators to lower the overall confidence in how secure it is to leave packages outside, given how much range the porch pirates can cover in a single afternoon.

I didn't say high trust is gone (although it certainly is in some areas), I said the reason we are cool with packages being left on our porches is the alternative is inconvenient.