To me, there are three types of these types of shootings.
First there is the shooting where a new law might prevent a similar action in the future. The relevance should be discussed.
Second there is the shooting where enforcement of existing laws might have prevented it or similar actions in the future. The lack of enforcement needs to have attention.
Then there is the shooting where every part of it is legal and no new or existing laws would have stopped it.

It would seem that lately the politicization of these incidents happens immediately without knowing the facts of the case. Is it fair? No. Will it continue to happen? Yes.