The murder of OP isn't that interesting. Everyone who is knowledgeable about the case knows it can't have been a conspiracy. It was a lone gunman, possibly a drug addict, seeing OP and his wife, seizing the opportunity to kill him. But what is interesting is the completely disastrous following investigation. The police in Stockholm fucked up in every possible way there is to fuck up. Records were not kept, witnesses…
Can you please elaborate? I could very well imagine a seemingly lone gunman who would indeed be a part of a conspiracy, and I have a kind of a direct experience: I was personally a victim of a robbery where only one man attacked me, in what at that moment appeared to me as a completely random attack. Only after that didn't went as planned, a second man came, but not to help me but to help him, to my complete surprise. By chance and my luck the attack was ultimately not successful, but their goal was anyway not to harm me but just to get something I've possessed. Even more interestingly, after reporting the case to the police and after the investigation based on my previous movements before the attack it turned out that these two had two more accomplices. In total, at least four men were involved in one "small" robbery attack. The police told me they are aware of many such cases, and that there was probably even a fifth person involved who coordinated the four. And this all happened in the country and city of more or less comparable overall security and well being to Stockholm, not somewhere where everybody expects such dangers.
So what appeared to be a random attack is actually often indeed planned and involves more people. Even the thieves seldom operate alone.
Then what should be the arguments that there wasn't any conspiracy there?