So, if someone had a gun on the train and shot the b*tch, would that be justifiable?
No.
Huh? Did you read the same story I did?
And if you mean, if someone shot Davis, I'd say that's a resounding "yes".
If an overzealous prosecutor tried a good Samaritan who shot Davis to protect this Major, and I sat on the jury, there would be a "not guilty" verdict, or at worst a hung jury. And I'd make some really ugly comments to the press about the prosecutor afterwards.