ThisThis happens every day. Some jerk shoots another jerk somewhere for some jerky reason.
The difference between now and any other time before is that now 'gun control' is on the media's bullet list of topics to push. They don't have to lie about a story to alter peoples perceptions, all they have to do is selectively report on stories that fit their mold, and work to their agenda.
Notice, this shooting is not a mass shooting, its just like any other shooting... but it took place near a school. Fits the narrative, push it out there. Makes people think 'something must be done! It's an epidemic!'