I went to the preschool to pick up a stranger's child
Why would you do that?
I wouldn't if I had thought about it.
That's because it's beyond wrong to kidnap children and you know it. You need to turn yourself in.
I am not a kidnapper, someone asked be to drive their kid home.
If you are doing a taxi service that is great but you need to think about the consequences of this. If kids become to comfortable to strangers they might actually get kidnapped by a crazy person.