Take bundy ..and the girls all looked like his first scorned love...a hatred of women.....
Cunahan ...the gay angle
Dahmer...gay angle again and possible pedophilia...ect ect ect...
ALL acted alone.
A comparison could possibly be made to the Manson gang in that more than one person was involved..however this also has a passion crime angle to it with regards to the love they all had for Charlie....
The perps in this crime hate us. They are randomly ruining families just like 9/11. They are loving the fact that we are once again in fear....
I would not be suprised if it is foreign terrorists or some wacky asian americans.