I spent four years working in the only building that the Unabomber bombed twice (Cory Hall at the University of Califoria, Berkeley), when I was in grad school, though the bombings were in the 80s and I was there in the early 90s. But when I was there he had not yet been caught, so we didn't know he wouldn't strike again.

In that case, the killer's identity was unknown, but with so much text authored by him, the FBI figured (correctly) that someone would recognize the killer by his writing, and that outweighed the negatives of giving him more publicity; he already had plenty of that.