UND Philosophy Professor advocates irrational behavior when people see guns:

The questions that concerns me now is how we bystanders should react when people come into a store with guns. There really is no legitimate way of determining intent. Even if the people with guns are carrying a sign claiming to be activists (which they do not do), they could be lying, just setting us all up for slaughter. And since there is no way to know what is on their minds, all we have are our instincts, but as we all should know, our instincts are often racist, classist, and frequently mistaken. So, what should we do?

My proposal is as follows: we should all leave. Immediately. Leave the food on the table in the restaurant. Leave the groceries in the cart, in the aisle. Stop talking or engaging in the exchange. Just leave, unceremoniously, and fast.

But here is the key part: don’t pay. Stopping to pay in the presence of a person with a gun means risking your and your loved ones’ lives; money shouldn’t trump this. It doesn’t matter if you ate the meal. It doesn’t matter if you’ve just received food from the deli counter that can’t be resold. It doesn’t matter if you just got a haircut. Leave. If the business loses money, so be it. They can make the activists pay.

Here is his response after some criticism: