My information comes from my studies in Australian Law.
Murder is still murder. In the law you have two things that make up the crime. The Mens Rea (Intention) and the Actus Reus (physical action, which in this case is the killing of another person). In the end, you still intentionally planned to murder a person regardless of circumstance (unless there's a self-defence element involved). An accident for example would turn it into manslaughter because the intention (Mens Rea) was never to kill someone, but the actus reus still doesn't change because you still did kill someone.
A scam is considered a scam not because of an outrageous deal. People will literally pay thousands for a piece of steak. A scam is when you're intentionally misleading people to make them cough up money your way, usually without fulfilling your end of the bargain or simply using a trick to take money (i.e, the African Oil Prince Scam where scammers asked for % of money to open a locked oil prince's account, promising to pay X back. Looks lucrative and too good to be true).
Both in the case for a loss of life, but mostly the action because someone actually has to die for it to be manslaughter/murder. Without it you can be charged for conspiracy of a murder, etc.
On the other hand an example of a crime committed where the intention doesn't matter is a traffic crime, like running a red light. Your intention doesn't matter here. What matters is that you DID cross that red light.
Adding into this on the subject of murder/justifiable homicide, a lot depends on how far you take it after the fact. If it can be proved that you had a grudge against the deceased, and the body was completely mutilated near to the point of being unrecognizable/unidentifiable, then you stand a far greater chance of being tried for manslaughter or a similar charge because intent could be inferred. While there are various defenses that could be presented, you still face that possibility because of the history between the dead person and the one that killed them.
With scams, these are much harder to tackle because most of them originate from countries other than yours and target those in your country. Because of the international aspect (and authorities/politicians in certain places being corrupt AF and taking bribes or joining the payroll), this becomes nearly impossible to counter. There's a lot of youtubers who discuss and deal with this exact thing. Some of them are able to shut down the scam call centers, but it goes back to the authorities not doing anything beyond basically saying "oh, there's a scam? that's nice. It's in this city? Huh, I'll have to look into that in about 5 years."
And to counter Syringe on his "red light", in some cases the intent does make a difference, such as a medical emergency where an ambulance could not be reached and the person is in need of immediate medical attention. While this can be somewhat planned for, if a woman is not in active labor when you go to the hospital, they may just send you back home and tell you to wait. In this admittedly rare situation, police will call it in and then provide an escort taking note of the license plate number to put into their action report. Other situations may not be as easy to plan for (such as a child with a continuous fever of 40*C/103*F or higher) but would be easily identified and accounted for.
