They do share the common qualities outlined here: forcible detention of people in one place, to monitor and control them. Whether you call it a reservation, an internment camp, a prison camp, or a concentration camp does not matter. They are all the same.
When you demonstrate your ability to mistreat people who come to you for help because they have no protection, you turn laws on their head. Laws no longer protect the weak from you, or from others with power. Instead, you use the law to make the weak suffer.