Does sound like a phobia.
When my first was 2, there was a huge scandal regarding a well regarded nursery school in the area, involving child abuse by the mother and son owners. It rocked my world.
I was shocked, naive, whatever, but thereafter was very scared of nicey-nice people, teachers, coaches, anyone. Was petrified that someone would kidnap him.
My hyper-vigilance caused me a lot of heartache. He is now 33, and the other day I had to admit to myself, things I was so concerned about didn't materialize. Phew !
So I can see how the documentaries would concern you.
But that doesn't explain why you would feel that way about your child's father.
I suggest counselling before you make yourself and everyone in your child's world crazy.
Its worth being concerned, but there is a point where your fears are getting the best of you and you don't control them, they control you.
Respect baby steps. Most work gets done an inch at a time. Just break ground.
Some get annoyed that people are so odd; lucky folks know that's the fun part.