"It is not an all or nothing gambit. We can have sensible gun control."
I agree with this, completely.
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I understood what you were trying to do but your demonstration loses value with an inaccurate comparison. Unfortunately, there are nuts on both sides using logical fallacies to push an agenda. Also, keep in mind that admitting an argument isn't "stupid" doesn't necessarily mean it's correct. .
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AKJimBob is correct that gun control laws will have little to no effect in the short term. He is incorrect in the assertion that it would be the long term effect. Laws in place holding gun owners accountable for the weapons they own can help. Laws in place directed at making it more difficult for the wrong people to access weapons can help. The goal here is reduction because elimination is unlikely.
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The truth is with every domestic attack like this, more people will be for gun control. If gun advocates keep the stakes at "all or nothing" eventually the result will be "nothing", like drugs.