The insinuation here, is that you believe that love only counts if the person will simply drop all of their prior beliefs at the drop of a hat in favour of you.
Exactly. Why would a woman who genuinely believes the Fuhrer is a messiah - as many did in the late 1930s - risk her life and reputation for a Jewish husband?
Love and loyalty are very multi-faceted emotions
"Yes, I betrayed you, but you have to understand my circumstances" - that's how all traitors talk. Half-loyalty is despised by both friends and enemies.
On the other hand the husband may want to protect their wife out of love and will want them to report him so that she will be safe. In the latter case, the wife is still showing loyalty to her husband by honouring his wishes and reporting him, allowing himself to sacrifice to keep her safe.
This is a family of failed species. In a family that wins evolution, one member protects another at all cost.
