Results may be like the stories of the guys who stopped a Grizz with a 22 rifle. You don't hear about the ones who tried .... and got eaten.
You'll hear a lot of commentary about the 22 being an inadequate choice for a defense pistol, (and I believe it is). On the other hand, imagine what it's like being HIT with one (or several).
As the previous post said, it's better than not having one.

There is nothing so frightening as ignorance in action.