SHOOTING AT A WALMART -- should we blame the rhetoric?

One person appears to have been killed in this incident. It's no laughing matter. So let me ask a serious question about the implications it has for our political discourse.

Should I expect a Paul Krugman column this week inveighing against the heated, anti-Walmart campaign that is being conducted nationwide by labor unions that haven't managed to organize WalMart workers? I hear they have the company in their cross-hairs.