This is no doubt true in some cases. Thinking back to my childhood, I encountered what would have been called 'inadequates' (sad word), but also good looking young men of 18 or so and dirty old men generally.
This was between the ages of 8 to ten and during the 50s at a time when I was on my own a lot so more vulnerable.
ETA Just to be clear, the young men - one came and sat by me in the cinema and tried to feel me up but I moved and another followed me through a wood, hiding behind a tree watching me at one point and then chased me but I escaped. Very frightening. There are other incidents I could recount but have to go out just now.
I think we all encounter strange people in our childhood, its how we learn about people.