I once ran over an Opossum, and two separate rabbits the same night within a span of 5-minutes in my car. At first i felt bad, but then I realized that those animals were stupid for running out in front of my ride and my conscience was cleared.
And I can't tell you how many times as a truck driver I've had deer run out in front of me in the middle of the night. Fortunately, I've never hit one of those but I've literally missed a couple by mere inches. If it's up to me to make the choice between taking out Bambi and trying to swerve with a 40,000+lb load. Guess which one I'm gonna do?
Don't feel bad. You should have put him in a bag and had somebody make you a funky-fresh Sunday church hat.