The title of this series does not represent the crimes of David Berkowitz, but Maury Terry's dogged pursuit of the various crimes of the Son of Sam. Many claim that Terry was a conspiracy theorist, but there are far too many coincidences that occurred for his views to be false.
The NYPD committed a series of mistakes in their investigation and they were desperate to find a perpetrator. I will not go into their mistakes, but Sons of Sam states what they are. Son of Sam would not exist if the NYPD had investigated further. It might have been something similar to how those reference Manson such as The Family.
Some of the information that is said in the series is questionable. Terry became consumed by the case until it became his life. He could never quite fit the puzzle pieces together and it devastated him. People's lack of interest, the lack of help from the NYPD and the fact that no one seemed to take him seriously negatively impacted his life. Sons of Sam shows that, most likely, there were multiple killers involved with these killings. This fact was corroborated by Terry's research.
Most of the information in the show needs to be taken with a grain of salt. However, there is one piece of information that I find very plausible: as many as five killers were involved in the Son of Sam killings. Others will view this docuseries and think different thoughts, but I was astounded that the NYPD refused to further investigate the crimes. New York was crime-ridden in the 70s, but this is still no excuse. Politics should never come in the way of justice.
I personally want to thank Maury Terry for all of his research and his numerous discoveries. His research gradually ruined his life, but the Son of Sam crimes will forever be seen differently. If you are a crime buff and unaware of certain events regarding the Son of Sam crimes, I highly suggest you watch the show.