As corporations like Walmart and Kroger are responding to recent spates of gun violence by asking customers in open-carry states to leave their guns at home—well within their rights as business owners—Congress and the media are debating how (and whether) there might be anything done about gun violence in America.

Spoiler alert: Joe Biden is probably right that nothing is going to get past Mitch McConnell in the near term. Accepting this reality, politicians are taking their fights to Twitter, where most of America’s insufferable political arguments take place.

At question here is how the Texas man who shot 29 people and killed seven on Saturday was able to get a weapon; he was prevented from purchasing a gun five years ago because of mental health issues.