Laser, back in the day people remembered the names of the killers because it was such a shocking event. Jack the Ripper, Lee Harvey Oswald, Charles Whitman, Bonnie and Clyde, Charles Manson.
Nowadays you have to do some extraordinary or particularly twisted in order to stand out from the herd of nutcases: Jeffrey Dahmer, Ted Bundy. Without looking it up, do you remember the name of the original "Postal" employee that shot up his post office? The fellow that shot up a McDonald's in 1984? Were you even out of diapers back then? Just how much history have you experienced outside of a textbook?
Or more recently: who was the mall shooter? Remember his name?
Here's a good exercise for you: Google "Post Office Shooting" and count the different events that have happened in the last 20 years. How many do you specifically recall? I don't recall very many, personally. They blend in because of the volume of events, which is supportive of my ideas.
In summary, *you* are full of ****.