Non custodial parent and kidnapping

You really have to wonder what goes through the mind of a parent who kidnaps a child and holds them away from the custodial parent. I was reading this on Facebook and I just cannot imagine! Have you ever had to deal with a situation where the non custodial parent kept your child from you, or know andyone that this happened to?

Link to the Facebook missing child story here:
https://www.facebook.com/sliceofhumble/photos/a.5…

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    09/15/14
    My ex has custody and he has kept her away from me before the divorce went through just to hurt me. He did twice before his mom found out... While he has custody according to the court, his mom takes care of her and we get along like friends.
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    About Melissa
    Birth: December 31
    On Moms.com since: Mar 3, 2014
    I am a single mom of two fantastic kiddos that I love to pieces. Currently in school working towards my teaching degree. You can find me most days on www.mommathoughts.com when I am not here chit chatting! :)