It's an extremely accurate term, and using it in this context serves the purpose of not minimizing the importance of their being the sites of atrocities and internationally-decried human rights violations.

actually, it serves the purpose of riling people to action perfectly because it captures the scale and nature of the detainment centers at a time when information coming out of those centers is extremely limited and the state of a hearty share of the public rhetoric is that the people contained within the camps are subhuman.

the camps serve no productive purpose, yet here we are with a bunch of them in the country anyway.