Wal-Mart hates families
Wal-Mart claims to be pro-family. If they were pro-family, they would use their position as the nation's largest employer to set an example instead of treating people like crap.
How are people supposed to live if they don't know when they'll work or how many hours they'll get in a week? This system will be used to weed out tenured workers, workers with families, and workers needing full-time employment.
What Wal-Mart wants is a bunch of cheap, disposable employees that it won't have to worry about achieving higher wages or needing benefits. No wonder so many people think of Wal-Mart as the Evil Empire.