responding here since rate-limited:
It has been estimated that up to 40% of Coca-Cola's annual revenue comes from the food stamp program. When a bipartisan effort arose to remove that poison from the schedule, the industry's lobbyists and non-profits were engaged, and set about making the removal into a racial issue. They succeeded, and the politicians promptly backed-off. "Just incentives" doesn't fly when the incentives themselves come from a single source, directed by unelected administrators, who may be subject to considerable private pressure.
"All professions are conspiracies against the laity."
- George Bernard Shaw