The Murder of Edgar Allan Poe

I agree because in the end a prostitute actually runs in the same circles or at least attempts to. 

But the mainstream of the Kennedy assassination, which embraces the conspiracy theory, can't believe that he could be killed by a lone gunman who was a relatively common man. And the mainstream of the Whitechapel Murders, which doesn't embrace the respective conspiracy theory, can't believe that these women/prostitutes could be killed by a high class pillar of society....

Although with a perception of prostitutes as common street people, Poe's like-on-like violence theory might suggest that the mainstream is correct.

There are many ways to look at it but these prejudicial profiles are definitely based on a false bias against the victim. There's no way to come to a right answer on that basis. You can't profile while denigrating a victim but I don't think it's necessarily a denigration on everyone's part when they label the victim a prostitute. 

Here's another one in the same vein:

If a woman gets killed by her husband and no one knows anything about him, and there's no evidence at all pointing to his identity, is there any way you can guess a possible profile of the man based solely on victimology of the wife? 

That last question surprisingly stumps a lot of people even though it's a quintessential example of "William Wilson Effect". They can't seem to figure out how to profile an unknown spouse without documentation or witnesses but only by common sense.

As for the Murder of Poe, one man said his last words included "self murderer, there is a gulf beyond the stream" but he seemed to have a temperance agenda. Death by elections, cooping and rabid rats seems more likely. The cooping or election gangs worked for the political candidates so it's not like there's no William Wilson Effect here either. 

Another example of this effect would be shown in the Oedipus story where he kills his father and marries his mother unknowingly. I think it has more to do with William Wilson Effect than childhood psychosexual development. Maybe more on that later....