It varied from boat to boat, just like their conduct in war, some would aid survivors from shipping, others would...well...not. Generally speaking though, the uboat arm, by its nature, sporadical contact, hard to keep track of, pretty independent, was one of the least political of the arms. Even in the other arms of the Germany military though, outside of the specialised divisions (SS and such) it was a varied rate of adherence to the political ideals of the regime, but it was harder for it to be openly expressed because of the Gestapo.
You could likely say a similar thing about the Soviets, to be honest.
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