How do we deal with thieves, vandalism in car while its rented out? Several passengers could be fetched per day. Not possible to identify who did what unless cabin video cam is installed. Even then it might not catch sneaky/subversive vandalism attempts
Risk vs rewards my friend. There's risk in business. Nothing is foolproof.
We can mitigate as much as possible with cameras or other means but mischief may happen. It's part of being in business.