There are people who will stop buying kinds of lettuce after seeing news stories about these recalls. I mean stop for months.

I agree, when a recall happens the store should pull them from the shelves, and consumers shouldn't have to worry about it. Not everyone feels this way.

I'm only making a point about perception. There is a feedback loop with media, Facebook, whatever. The public CAN lose trust in lettuce, and it is not something to take for granted.