under table cry
The DJs are totally to be blamed. You should not ever prank call a fucking hospital. And once they realised that they were succeeding, they should have stopped immediately and fessed up, not gone through with it and then proceed to play it on the radio. They might have thought it "harmless" and that they would "never succeed", but that prank always had the potential to at least cause another person to lose their job, and that makes the the base "joke" fucking awful.

Also, the nurse who committed suicide wasn't the one who divulged private information. She just answered the phone because there was no receptionist and then transferred the call to the staff who were taking care of Kate. THAT nurse proceeded to also be duped by their fake accents and divulged information.