I thought that Marlena showed a great deal of restraint when speaking with Sami. Yes she is bound by her profession to keep everything a secret. However, she just found out just what Sami is capable of!! Had they called the police in the first place, Nick would still be alive and in jail for attempted rape. After all Kate and Sami were witnesses!!!
However, if anyone deserved to die it was Nick! He killed one man, stocked Melanie, and played mind games with almost everyone in Salem. He was not a nice person!!