To what extent should those who joined the Nazi party to avoid persecution be condemned?

Some joined the Nazi party because they supported the platform. Others were conscripted into service for the Nazis, though they never formally joined the Nazi party. Then there are those who did not support the Nazi party—or at least claim not to have—but who formally joined in order to protect their careers or families after being intimidated by the Nazi leadership.

Considering the number of people who fled Germany during this period of time, how much of an excuse does this last group have for their actions? Does the extent to which they were willing to play the role of a Nazi matter? Martin Heidegger integrated Nazi ideals into his writings, for example, whereas Herbert von Karajan just kept conducting orchestras. Then again, Karajan was Austrian and under less pressure to join at the time when he did.