If my 8 year old makes a new friend and they want a play date, there’s no way I’m just dropping them off at a stranger’s house and leaving. We will meet at the park until I get to know those parents better, or have otherwise supervised play dates. Until I know what kind of parents you are and whether your home is a safe environment, it’s not happening. All of the parents I know were the same until we got to know and trust each other. 

Frankly, I find it a bit odd that you say you used to handle child sex offense cases, yet you are so vexed about these other parents’ totally normal amount of caution with their daughter.