Holocaust - Upstanders & Bystanders

After I read about some of the bystanders and upstanders from the holocaust, I was thinking about what I would do if I were to be in this situation. I would want to be an upstander, but knowing how I am, I wouldn't because I'd be afraid of the result. I would feel regret after knowing I could've done something to help others. I believe people would stand by and watch for multiple reasons. One of the reasons is embarrassment, because you won't know what others will say. Another reason could be because of being too afraid. They were too scared to speak because they knew what would happen if they did, and did not want to risk it. I think people would be an upstander because they were done with being treated unfairly. They were not afraid of what people would think of them. Someone that could've inspired them to speak could be other public speakers that were not afraid of what others would say.