On Monday, the day before a fourth man in a suspected plot to bomb jet fuel tankers at Kennedy International Airport turned himself in to the authorities, Mayor Michael R. Bloomberg waded once again into the emotional discussions of how ordinary residents can conduct themselves in a post-9/11 world.

WCBS-TV quoted Mr. Bloomberg as saying:

There are lots of threats to you in the world. There’s the threat of a heart attack for genetic reasons. You can’t sit there and worry about everything. Get a life.

The mayor added, “You have a much greater danger of being hit by lightning than being struck by a terrorist.”

Digg, a Web site that allows news readers to share articles with each other, has been fairly abuzz with readers who’ve highlighted the WCBS-TV item.