Movies about serial kellers ,incentive ,detractor or information?

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Several movies have been made about serial killers ,names like Ted Bundy ,Jack The Ripper, John Wayne Gacy have all been immortalized in movies. What I am curious to find out is why are these brutal and savage men being made famous for infamy. Also couldn’t such an action serve as an incentive for upcoming serial killers especially when they know their actions could be made into a movie ,flattering don’t you think ?.Another incentive is that some serial killers like Jack The Ripper, the most famous of them all were never caught, is perhaps the ultimate attraction, everyone loves a movie where the stars walk off into the sunset to live happily ever after. Another feature of some of these movies is that they show the art of killing as well as some techniques for evading the law. I am going to be as balanced as I can be and argue that these movies might serve as a detractor in instances where the serial killers are captured. I am also going to argue that these movies could serve as information as to the history of serial killers but apart from those two points ,I cannot find sufficient reasons to justify why movies like these should be made. Certainly I think they have very little entertainment value ,there is very little pleasantry to these movies. One last question that has always crossed my mind is how do the families of the victims cope when they see these movies If you can find overwhelming evidence to justify the making of these movies ,do highlight them ,please.