He 's a murderer , but ` ` not crazy , '' a criminologist says . Breivik , 32 , has acknowledged carrying out a bombing and a shooting rampage Friday , a judge said Monday . ` ` Mass murderers rarely are psychotic , '' another psychiatrist says . Experts disagree over whether he was primarily motivated by revenge or a desire for infamy . Some see similarities to Unabomber , Virginia mass shooter , Oklahoma City bomber .
He 's a murderer , but ` ` not crazy , '' a criminologist says . ` ` Mass murderers rarely are psychotic , '' another psychiatrist says . Experts disagree over whether he was primarily motivated by revenge or a desire for infamy . Some see similarities to Unabomber , Virginia mass shooter , Oklahoma City bomber .