Genuine question. Why do you feel we should keep useless people alive?
We already do not send people to prison for unpaid debts. And it is not a genocide we could easily see through - the unemployable, a number growing daily through automation, will not just sit down and die, but likely burn all of society down around with them if abandoned by said society.
This isn't some isolated fragment of the population. This decade, its going to be 11 million US citizens associated with the trucking and transport industries. In the decade following, service jobs, office jobs, actuarial, law, and medical jobs will all be going to AI neural nets and robotics with realized vision. And if we ignore how they contributed to the economic engine that produced such abundance, and let them starve while the owners of the means of production reap near infinite supply, that would realize our current extinction event to its fullest.