>>6563
You watch too many detective movies.

But think logically how are you going to catch a serial killer? you occasionally find young women hanged on the trees using red silk rope. so you clearly see that it is the same killer what are you going to do to catch him. you cant sends police patrols to guard everything all time. You do not have any motive you just know that women randomly disappear when they go outside and never come back.

There is nothing to hold on, nobody to suspect, anyone can be the killer very likely he is even standing next to you observing you collecting evidence, but you don't know.
Even if you find something to hook on how do you know that it is not just all just fake stuff thrown there to mislead you?
The only thing you can do is wait until he will screw up something and get noticed by someone walking their dog or one of his victims will kick him in the balls and escape.

When I said messing with the FBI is fun, I meant more about the idea of messing with someone way more powerful than you are.
It does not matter how much resources they assign they cannot really do anything that makes you feel extremely powerful stronger than the state itself
And yes quite a big chunk of the population hates police everywhere, especially in the US. :)

The fact that killer writes letters will not help much if he is not a total idiot.