While there may not be an advantage for directly murdering someone with your own hands, there is definitely the issue of being unconcerned that actions that you feel beneficial for you resulting in the deaths and suffering of others. That is behavior that we see all the time in business and politics and I think is a better representation of the type of “killer” that psychopathy should be associated with. You very rarely get a Jeffery Dahmer, but you will see a lot of “CEO that is unconcerned about safety or living wages”
ETA: and the harm here is compounded since the latter behavior is often admired and rewarded rather than punished, so even non-psychopathic or sociopathic people will emulate it
