So would you get angry if a sabre-toothed tiger charged at you when you weren't expecting it? Do you get angry when a clear day gives way to rain? Do you get angry when a short story has a twist ending?
Expectations not being fulfilled doesn't necessarily cause anger. It may lead to sadness, or laughter, or fear, or disappointment, or any number of emotions. But it normally only leads to anger when the frustrated expectation is about social rules.
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If you're unbiased then you should be underestimating your opposition about half the time.
Only if you have no margin within which you can be considered to be "correctly estimating."