It's just too much of a stretch for me, loves2b, that LE would just trust that a group of people who would kidnap and/or murder one child, would not harm another child, and simply let them roam free.
No, that doesn't make sense at all. Let's assume, unfairly, that TH & DD and Someone X did this crime to..hmmm..get back at Kaine. Well, then, what's to stop this horrible band of criminals from snatching baby K? If they're free and on the streets, they could do that, or they could add in other gang members to do that. Maybe for revenge they'd go after DY's other child, even though he doesn't live with her.
All of that sounds pretty darned ridiculous to me.
If I know that there's a guy up the street who the cops have evidence enough to arrest for say, rape, or B&E, and they don't arrest him, I'd be raising all kinds of heck.
We're not talking about a few days here. We're talking about months, with more than a million dollars invested, untold manhours, and so far, LE has come up with nothing that has enabled an arrest. Nothing.
If they have evidence on any crime, and don't arrest, IMHO that is serious professional misconduct and should be investigated. Especially given how much they've put into interviews, posters (which did yield a worker and a white truck at the school they failed to find on their own by asking about occasional workers), and other items, you'd think that they would be eager to improve their public image by making an arrest.
In fact, I'd bet that if they could, they'd have a huge press event to show TH in handcuffs surrounded by LE. They need to repair their image, and I have no doubt that they will seize her in a New York minute if they think they have enough evidence on even a traffic violation.
I just can't imagine LE just not using evidence to effect an arrest. If, that is, they actually have it.