Don't get me wrong, I don't think humans are inherently evil. In fact in times of crisis (like the one you mention) we do tend to come together and I think that's evidence that the belief is incorrect.

I just had a discussion the other day with somebody who outright told me that they think humans are inherently evil and must be managed under a system to keep in order. I don't think it's an uncommon belief and nor do I think it's a bleak world because that belief exists, it's just a mistaken belief.

I would argue that you see the belief raise its head far more when people are interacting with others who they don't consider in their "in-group".