It's pure emotional posturing which ignores the emotional posturing which caused the tragedy in the first place.
The progressive prosecutor could have charged the future killer with weapons violations which would have prevented him from legally buying the new weapons used in this crime.
Existing laws might indeed have prevented the crime, if only liberals had followed them. But misplaced feelings of white guilt overrode doing what the law demanded.
Republicans better man up because Democrats sure won't.
Here:
If these laws would not have stopped this shooting, well. They might stop the next one.