Yeah but it’s you who has to make the decisions about your kid’s safety, not them. And you don’t know what you don’t know. I wouldn’t blindly 100% trust strangers with my kid just because of a logical fairness any more than I would lend my car to random person off the street because I have no evidence they would steal it.
I think it’s best if you can get to know people first. Even if it’s just for your own peace of mind and so that it’s visibly clear to them that there will be someone holding them accountable.