in·teg·ri·ty ( P ) Pronunciation Key (n-tgr-t)
n.
Steadfast adherence to a strict moral or ethical code.
The state of being unimpaired; soundness.
The quality or condition of being whole or undivided; completeness.
Steadfast adherence to a strict moral or ethical code does not make the code correct. It only means you do as you state.

So while an SS Deathcamp guard would be a believer in his ethics and acts on it, it does not make the ethics something wonderful. He has integrity of code and deed. it does not however make his code any better.

It is like most things has to be seen in the holistic view to understand what it's value is.