the Jews you see had been very conditioned to expect the worst, fear the worst.Plus too, by the time they got to the camps, they were extremely weak, cold, half-starving, most probably had dysintery (sp?), etc. etc.
It's too facile to say "they should have done this or that." As we sit in comfort in our well-heated homes with all the food we need, It's all too easy to judge people in circumstances grossly unlike anything we have ever experienced or could ever expect to. All too easy, and wrong IMHO.
Alex