I'm not entirely comfortable with the narrative that the costs and risks weren't weighed carefully.
It wasn't that the pros and cons weren't weighed. Every human decision involves the weighing of pros and cons.
For every decision that harms someone, a person decided that the harms were justified because of some other goal they deemed necessary.
The solution is not to generally apply more careful and scientific thinking, because the problem is not a lack of careful and scientific thinking. The agencies in charge are full of people who study this exact problem for a living and are fully qualified and trained for it.
What we're really grappling with is a clear mismatch of priorities between the decision makers and the "decision-makees." Why didn't their study and training lead to a decision that we're all comfortable with? If someone is to blame for this poor decision, why have they not been indicted -- and if we, the public, are to blame for our complicity, why haven't yet we acknowledged our mistake?
No one wants to point the finger out of fear of being called divisive. But these children will grow up soon and one day ask, "Why us?" I hope we have a better answer for them than, "There was much we didn't know..."