Can I offer a male perspective here?
Having been excluded by my ex for so long, I didn't feel like a `proper parent' - even though from the day he had been born, I cared for my son as much as my ex did. When he was allowed to see me (well, the court ordered it) I felt nervous for quite a while - all the accusations, all the nasty comments, etc. made me feel useless.
Even before she left, my ex made it clear that whatever I did wasn't good enough where my son was concerned. She sniped, criticised, complained, etc. so in the end the action I could take to cause the least amount of friction between us was to let her get on with it. This went against all of my instincts as all the men in my family are very `hands on'. What I did, I did because I thought it would reassure my ex, even though it went against my better judgement.
I know lots of people here say their ex's are useless and have pointed out various scenarios to prove this - but have you heard the phrase give a dog a bad name?' Is it any wonder that some dads are usless' when their every action is scrutinised? If you know someone is gunning for you, the easiest option is to present the smallest target possible to minimise the inevitable criticism you know you will face.
Personally, before I hand my son back I check and recheck that everything is `OK' where he is concerned because if I don't....well, it will and has been used in court against me.
This post isn't a dig at anyone here - just my point of view as a father.