A thesis should contain many elements. First of all, your thesis will tell the reader how you interpret concentration camps during the Holocaust. It will also let the reader know what to expect from the paper and may be something that others will disagree with. It will answer the question that you are asking, "Were concentration camps inhumane?" You will want to convince the reader to agree with what you have to say.
A good thesis should answer the following questions:
- Do I answer the question?
- Is it specific enough without wandering?
- Will others challenge it?
Much of this is going to be driven by what it is you are going to prove in the paper. I think that this will be supported by what you have in your possession in terms of research materials and sources as well as what the task or assignment is. If this is for a class, being able to understand the nature and dynamics of the assignment will assist you in carving out a thesis statement that is aligned with what is being asked of you. I think that there are several paths that can be pursued, but I also feel that this is going to be contingent on what you have, what you need to do, and with what you feel comfortable writing. Somewhere between the valences of all three lies your thesis statement, something that will be up to you to reclaim and identify.