Last month, the federal government bought a warehouse next to her cheerleading gym in Surprise, Ariz., which the administration plans to convert into a detention center for up to 1,500 immigrants.

Ms. Bradley, the co-owner of Woodlands Elite Cheer, said she worried that a detainee could escape, or that protests could break out. The children who train at her gym are as young as 3 and could see “people in shackles” next door, she said.

So it's more NIMBY and not so much concentration camps are bad in general.