I’m not sure I understand your point. The Good Samaritan performed labor on the Sabbath. The priest and Levite who walked past the wounded traveler did no work on the Sabbath. They obeyed the letter of the law. The Samaritan, on the other hand, kept the spirit of the law. He kept the Sabbath holy by showing love and compassion for his neighbor, the wounded traveler. Do you think the Good Samaritan behaved improperly, i.e. against God’s will?
If the Good Samaritan broke a divine commandment, then yes, he committed sin, by definition. The real question is if the original commandment that he broke was divine or not. To me, it’s clear - it was not. Abstaining from physical activity periodically as a religious obligation is meaningless, empty, counterproductive, harmful and irrational, and too silly to be traceable to a divine entity.
There was no “spirit” to that commandment which could have redeemed it as divine. The commandment to love one another is a commandment totally independent of the former commandment.