Reasons why concentration camps should be preserved in WW2?

[Lola]

I have an in-class essay tomorrow, and have to write about this topic.

I need 3 points as to why they should be preserved.

This is about the concentration camps in WW2, most of which in germany

I've come up to one point which is that we shoulden't forget about the bad things that happend to them, and remember the horrible things that happend in the concentration camps during WW2. I

need 2 more points.

Thanks in advance