Anything is better than nothing, so I would never say worthless. But where I draw the line for self defense purposes personally (YMMV) is .38 SPL +P for revolvers, and 9mm for semiautos. Even though plenty of people have been killed by less, and I wouldn't want to stand in front of them, anything less than those have a spotty track record as far as stopping power is concerned.
Not only do you need to bring a gun, you need to bring enough gun.
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