If the animal is a predator you firearms might not help. They are by nature endowed with not only strength but cunning. However, I agree with you. Man is the most dangerous and harmful creature on earth.
If you get ambushed in the woods, then it is another story. You may not get enough time to use your rifle. But if you are out in the open, and is able to spot the animal from a good distance, then the latter has got no chance at all.