The point here is not that human beings can determine what they should do with regard to the Sabbath. Rather, it states Jesus' authoritative interpretation of God's intention in giving the Law - the Son of Man here refers to Jesus. The Law was given to benefit the people, not to oppress them. The healing, which also takes place on the Sabbath, illustrates that Jesus does not intend to abolish Sabbath observance as such. Rather, he was against depersonalized legalism.
Love shows itself in deeds more than in words.
Truth upsets people. One Main Point God's redemptive work knows no constraints, not even the Sabbath law.