Probably humans just did not devote the attention and resources to get good at it, Anitam has very precise procedures to prevent that.

...they still wouldn't kill the nanny over this.

Well neither will the horrible moron judge, so they're in good company.

Anyway, the Safe Summoning Authority has a binding for kids to prevent them from having magical accidents published.

They put circles out for their daughter. 

A little girl appears in the fairy circle, sucking on her fingers and looking kind of stressed out. She rockets into her father's arms at the binding's speed limit.

Parents burst into tears and stop grumbling about the continued survival of the nanny. The colony planet holds a party. Their children will be immortal daeva!!!

Anitam is thrilled about that and sends another hundred thousand people.

The other Amentan countries would kind of like to know where Anitam is sending all these people since they don't seem to be on the colony planets. Is there a secret colony planet? Why?

They're going to live with the angels and fairies and demons.

...how do they get there?

Anitam declines to specify.

Can anybody else get in on this?

Nope, sorry, Anitam's carefully screening people who are allowed to interact with the demons and angels and fairies and the one time they weren't careful enough it was a catastrophe.

...a hundred thousand people? Carefully screened?

Yep. (They also send them through in batches such that if you fuck around you get separated from your family.)

How do you carefully screen a hundred thousand people?

You put a lot of staff time into it and have demon assistance.

Other countries could carefully screen people too.

There are lots of colony planets, why do they care about this in particular?

Why does Anitam?

They don't! It's lower-priority than a bunch of things!

But they're still doing it. With careful screening.

Anitam will be happy to bump up the schedule of shuttles to the rest of the colony planets.

Yes please but why are they also colonizing wherever-daeva-live.