Not only is there a psychological impact on the officers, there is also physical implications. These people committing suicide want to be killed by the police. The fastest way to get cops shooting at you is to shoot at them. The suicidal person most of the time doesn't care if he actually kills or maims an officer for he will be dead anyway. He just simply wants the officers to kill him. Especially now that the police now know about this problem and are trying to use nonlethal force, more police are in danger. As the suicidal person gets impatient when police don't shoot him when he just waves the gun around, he will have to start shooting to get what he wants.