He could just as easily have killed her. By shooting her, he put her in at least as much danger as Logan would have--and there is no reason to believe that Logan would have attempted to carjack Denmark's van, but for the actions of Beck.
Counselor, you are trained in twisting both the facts and the law to conform to which ever side of a case you are on, and are doing a good job of that here. My hope is the civil jury is as astute a the Grand Jury and this whining bureaucrat doesn’t get a dime from Mr. Beck.
There is every reason to believe that, had Logan not been forcibly put out of action, he would have continued to rob and shoot people until he was. While is quite likely that had Logan not been pursued, he would not have tried to carjack Ms. Denmark, he almost certainly would have robbed and shot someone else (if not many more people).
If Logan hadn't cold-bloodedly shot Beck, one might judge Beck's actions as excessive. But since Logan demonstrated a willingness to kill without provocation, Beck's shooting clearly (almost certainly) saved innocent lives.