Answer:
They could participate in the violence because they are guards first, so they have the supposeable power to do so. Second, they probably come from wealthy, essential families. Also, they made an oath to give their life to Hitler and the motherland. If they didn't want to do this, then they would be banished from Germany or worse. They were also pretty much brainwashed into believing that what Hitler said about the jews was right and that they needed to clean their race of the "unpure" Jewish race.
Explanation:
Hope this helps!
