An amber alert is serious business. Even if abducted by parent or guardian children can still be in danger.
Some times mommas boyfriend does it because he is a pedophile or simply trying to prove to momma that he has the power to do it.
Some times some whacked out momma takes them for various reasons. Maybe she would take them because daddy is a nut job, an abuser, or has threatened momma and the kids with rape and murder.
Personally I would like to exterminate anyone who hurts children!