We had a stranger danger session when I was in primary school and I'd say that a combination of that and my mum scare mongering just about everything has left me riddled with paranoia about how everyone is potentially out to get me
, seriously, to the point where I don't go to parties if I don't know enough people there and I don't take taxis at night unless it's with other people etc.
It's worrying to see that but it's also totally normal for little kids, unfortunately. When you're a kid you don't really know what lying is beyond your friends claiming they've got something that you don't, or what they have is better than what you have... you don't think adults will lie to you because the only adults you really know are your parents, who you trust, and your primary school teachers, who you trust...