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To the political Left 'responsible' gun ownership means NO gun ownership. This is not exactly a secret.

Apply the full weight of the law whenever a person uses a gun irresponsibly.

Other than that you're talking about precrime, prejudging, and not giving people the benefit of innocent till proven guilty.

So which NRA member was irresponsible with handling their guns?

You don't have any proof that legal gun owners are not owning guns responsibly, what you have proof of is that mentally ill people are acquiring weapons legally and going on rampages immediately. The amount of gun owners who are responsible have owned weapons for generations and the amount of those people are in the hundred millions. Their kids learned to respect firearms and learned gun safety.

You are just emotionally unhinged and you try manipulate people to feel your misplaced anger.

I too am against crime.

And 'irresponsible' more times than not equals 'criminal'.