Especially when law-abiding citizens possess them. I mean, it's just not possible. I'm sure anti's would rather that we played "what if" and hoped that the repeat felon would just say, "oh, sorry" and leave. Because that's what happens.
A Georgia mother protects her and her children using a .38 revolver. Note that she hit him at close range 5 out of 6 shots and he was able to leave, get in his vehicle and end up in the hospital. Thank goodness it gave her the time she needed to get away. Wait, why would you ever need more than 10 rounds? Oh yes, because bad people exist and they don't stop when you want them to stop unless you make them.