From an economics standpoint the ideal labor force is slavery.
From an economics standpoint there is no point to the elderly they should be killed off once they are no longer viable laborers. Children are only useful if they show potential slave labor ability, and otherwise should be killed in adolescence if there are obvious shortcomings.
From an economics standpoint murder, war, and violence are viable tools in competition, as illustrated by cartel turf wars.
So it's OBVIOUS to me I should be allowed to kill you and your kid take your school start time slot if I am economically incentivized to do so / it's convenient aka economic to me and it is up to you to invest in the deterrent to prevent such things.
Oh, you're not in favor of such things? I guess you are in favor of regulation, humanity, and other factors in things besides raw "economics".