I rent out two rooms in my house. I also live in that house.
As a homeowner in a neighborhood that has had several recent 'acts of mischeif', I recently purchased two cameras to monitor my home. One faces the front street, and the other is in the living area, facing the front door.
Why, you ask?
1) Half of my neighbors had their car windows busted out last fall. I don't keep my car outside, so that's not an issue for me, but I care about my neighborhood's wellbeing, and so I want to help my neighbors catch the perps.
2) Once an Airbnb guest brought an uninvited guest with him without any notice. He didn't know the individual any more than I did. They were just ride-sharing, and since I was the first destination, I received an uninvited stranger at my home.
3) I have an electronic lock that allows guests to 'self-check in', and so I have no idea who is coming or going when I am not home.
My cameras aren't at all hidden, and they're not in personal areas (bath or bedrooms), so I don't consider this 'invasive'. It's my house, and I live there, too, so anything in shared living spaces isn't private anyway. I think I should be able to monitor my home as I see fit.
Camera's are added security, period. Call it a trust issue if you like, but I think of it more as an insurance policy, in case something shoud go wrong, relating to Airbnb or otherwise.