Yeah of course, isn't that obvious. As long as it's not straw men, it's totally fine.
Alternatively, it might be morally objectionable to lessen the degree of atrociousness of a particular atrocity by comparing it to another atrocity that in no way hits in the same ball park. There's a reason why we don't call school shooters "bullies". I think we can all agree that there is something wrong happening here. But you're degrading the severity of the Nazi and other similarly severe concentration camp and the people who went through it, by comparing it to these immigrant camps. 'They weren't given toiletries' vs. 'they were made into toiletries'. If you can't see the difference - or if you phrase the issue in a way that blurs the difference, you're doing something wrong.
Read the Wiki article on the
Hoeryong concentration camp, is that the conditions these immigrants are going through? Can you imagine someone familiar with the conditions here hears that there were concentration camps in North Korea. "Oh yeah, we have those. Can you imagine? No toiletries, cement beds, truly inhuman conditions!".
Don't get me wrong (as you'd clearly like to). Having young children or even adults sleep on cold slabs of stones every night is a terrible breach of humanitarian conditions. No government should be able to get away with forcing those conditions on anyone. But I don't think drawing the comparison really expresses the vital urgency for help these North Koreans had. I don't think a comparison to the living conditions in Nazi concentration camps in any way resembles the the severity of the conditions these families are going through.
What this type of comparison
does do, is diminish the extent subhuman cruelty can reach. Human can get so bad that they'll make children put their blankets and pillows down on stone floors to sleep and then not give them tooth brushes. No. 'People' can get so bad that their victims will spend each and every morning wondering if they'll be shot, poisoned or tortured that day, while subsiding on a single bowl of soup, working 20 hours a day in the freezing European winters with nothing but a worn shirt and pants, having seen the rest of their family murdered in cold blood in front of their eyes. They can kill 31 people because one of them tried to escape. They can force a human to stand on his tip-toes for 24 hours with water up to his nose. They can practice their surgical techniques on children. When you draw a parallel between these conditions and those,
you're the one hurting people.
You're teaching them to forget the lessons of the past, the true depths of inhumanity that people can reach. "This is the direction that Nazi Germany/North Korea took! Take care that we don't follow their path!", maybe. "This is like Nazi Germany/North Korea!", no. No, not at all.