What I think he means is that the bystanders knew what was happening but didn't stand up for it. They didn't fight for the Jews rights. But in my opinion that statement is wrong since anyone who stood up or defended the Jews would be killed.
Answer: So, your main idea or thesis here that you are talking about in this paragraph would be your goal to acheive things out of your own comfort zone.
However, more specifically you could make your thesis on either your desire to make new friendships or relationships / or you could make your thesis be about your desire to experience new situations that are out of your comfort zone..
Hope this helps some!
Supply the reading first then we can help you
