>>>Another possibility, based on a Pickton quote: "I know I was brought into this world to be hear (sic) today to change this world of there (sic) evil ways," . . . Perhaps after interviewing a given woman over a period of time he may have decided that she was evil and should be murdered. Other women may not have met the "standard" and may have been spared. It's a very fine line but it could be argued that in either of these cases there was not premeditation.
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>>>Bear in mind that any serial murderer is not going to be considered "sane". Both of the above arguments are (IMO :)) rational; Pickton's real motives may not be rational at all.
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>>I hear what you're saying, but if we accept that his purpose was to rid the world of women evil enough to have to be killed, then that in itself is, to me, premeditation. It may not be premeditation in the case of individual women, but it's surely premeditation in it's purpose.
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>What is getting these guys into this mood of looking for evil and killing the perpetrators? And why do they almost always have to tie it with sex - usually killing women? When was the last time we had a serial killer who killed those deemed evil for other stuff, like causing others to die (by means of neglect, or taking away their sustenance), or ruining families and/or lives (by con art, by identity theft, by corporate malfeasance) etc? How come there's never a nutcase who will go after the guys who cheat people into impossible loan schemes just to get them to lose their houses homes, then repossess them, tear them down and build posh condos? Why always "evil women"?
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>update: if the reason we never hear of these guys is that they aren't caught... never mind then.

They exist. They're called vigilantes.