In spite of that, he was friendly, and i recalled that mr. frank had been aware of this man's membership in the dutch nazi party before he'd gone into hiding, since the man had worn a party pin under his lapel. i remember that mr. frank had commented, "this man you can trust. i know he's not a nazi at heart. he must have joined the nsb because he was hanging around with a bunch of young men who joined. being a bachelor and needing a social life, that's why he joined too." which theme can be inferred from this excerpt? ]