Weeelllllllll, with cameras rolling, they kinda got shamed into the talk. It would have looked real bad if they didn't. jmo
I was thinking that Joran's mom might have insisted that the dad go talk to Natalee's mom at the gate. (?) I also noticed that when Natalee's mom was leaving, Joran's mom gave her a kiss on the cheek. I'm sure that both moms just want their kids safe and at home and are frustrated with the system.