Manopolus
Metaphorical Anomaly
So what is more likely then? Someone who wishes better gun ownership controls to potentially save lives goes out, gets a gun, loads it with live ammo and leaves it lying around in the toy section of a store, hoping that a child will pick it up, fire it and maim or kill other human beings. Or that someone who is not a responsible gun owner took their gun to the store with them, laid it down for a moment while dealing with shopping or a child, then forgot it. No need for a conspiracy theory here that I can see, or even a devious plan. Just human error.
I don't buy it being accidental. I also don't think it was necessarily the political motive that you suggest. I'm content with saying that I don't know the motive.