I love these kinds of posts. This is why I'm in love with this forum. The most random of questions brings about some awesome debate.
If Hitler didn't declare war on Poland, unfortunately, I think he would have declared war on someone else. I strongly believe in fate and if one means doesn't reach the end destination, something else would have. The victims of the holocaust were destined to die, and their deaths were supposed to spark emotions in others to do the things that happened. I believe we would be in the exact same spot we are today, except thinking... "What if Hitler didn't invade "