I think a problem we face is that people judge based on simplistic models. We see some comments saying that a petition is worthless. But if that petition succeeded many would have the opposite position. You can't judge purely on the outcomes. The scientists did not control the use of the weapons. These matters are extremely complicated. Simplifying it to good vs evil is in reality dehumanizing. People claim they are criticizing, but it is just pessimism. The world is not simple and often there are no good answers. No one will ever be good enough to be a saint because they are human and all humans are flawed. This makes it easier to bin them in the evil category. Pessimism is thus the easier perspective, but this is destructive. We humans are not the product of singular actions. It is important to remember that you can not condone certain actions but condone others. Scientists, just like any other group, is a non-homogeneous group of individuals. Painting with a wide brush is what we do to propagandize, not how we create a better world.