You are responding in a thread about a person saying they were driving at 60 when the deer only became visible "due to terrain" at 100 feet away, and therefore hitting it is no reflection on their skill or choices as a driver.
I suppose we're meant to interpret charitably here, but it really seems to me like there is a big difference between the scenario described and the one you're talking about, where the deer really does fling itself out in front of you.