They Are Serious
People think the Roman Catholic Church is not serious about the coming Sunday laws, but they are.
284. Rest from work is a right. As God "rested on the seventh day from all the work which he had done" (Gen 2:2), so too men and women, created in his image, are to enjoy sufficient rest and free time that will allow them to tend to their family, cultural, social and religious life. The institution of the Lord's Day contributes to this. On Sundays and other Holy Days of Obligation, believers must refrain from "engaging in work or activities that hinder the worship owed to God, the joy proper to the Lord's Day, the performance of the works of mercy, and the appropriate relaxation of mind and body". Family needs and service of great importance to society constitute legitimate excuses from the obligation of Sunday rest, but these must not create habits that are prejudicial to religion, family life or health.
- Compendium of the Social Doctrine of the Church
It's throughout all of their literature. They really think they have the authority to rewrite God's Law.