I've never gone through a divorce so I have no idea...but if in such a situation and I was going through a divorce I would consult my attorney to find out how to deal with this...this could not have been the first time one spouse was worried that another spouse might take kids and leave the country...surely there is something that can be done from a legal standpoint, and relatively quickly at that.
Remember, there was testimony by several individuals that Brad WANTED Nancy to leave and take the kids with her (back to Canada). He moved the date of their departure up! Once he saw the draft separation agreement and the financial terms, he changed his mind. He himself said HE altered the plans, during his interview with detectives. It's in the affidavit.
Yes, he did change the plans. But here are some thoughts:
1. There was no civil case yet since neither had filed for divorce.
2. He had full joint custody of his children at that time since they were legally married and living together.
3. She did not have a legal right to leave the country with the children without his consent.
4. He had as much legal right to possess the passports as she did.
5. He had a justified fear that she would illegally leave the country with his kids. Her mom basically testified to this in court by describing the conversation at the airport. NC desperately wanted to go back to Canada, and probably would have if she had the passports.
6. He took them and then offered to give her 1 so that they both had the same constraints. Again, there was no legal action underway, so outside of spending money to go to court to get a restraining order preventing her from leaving the country with the kids, what else could he have done? And since he had as much right to them as she did, his actions were cheaper and more rational than going to court. A separation agreement would have worked this out with a court order, but they didn't have one yet.
7. He did not take her passport, which goes against the thought of being controlling. If he was trying to control her, he could have also taken that one. She was free to leave the country and could have boarded the plane back to Canada with her family if she chose to do so...just not without the kids (again, she legally couldn't have done this anyways).
And 1 more thing...if she wasn't planning on taking the kids and leaving without his consent, why were the passports an issue to begin with? He obviously was concerned about her doing that.