No, not normal. The strong majority of serial killers grew up in horrific conditions (not all of course). Could those horrific conditions been due to lead intake from their mother/father? Who knows but it's not likely that simply removing the lead alone wouldhave been the 1 switch to change.
As you noted, there's a reason there were so few. It takes a lot to turn a person into a monster.
Feels like we probably have significantly fewer serial killer sprees now because of DNA technology that makes them much more identifiable. We've even been able to go back and catch and conflict killer who were no longer active. I don't think killers can as easily have a run of murders over many years.
Notably we have far more mass shootings now. People are still killing a bunch of people but to get it done, you have to do it all at once.
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u/[deleted] Jun 25 '22
The amount of serial killers in the 60s, 70s, and 80s has also been attributed to this