No, laws are not infallible, but doctrines and dogmas are the subject of infallibility.
Further it is good sense to pay attention to sound reasoning.
**From EWTN Q&A: Answer by David Gregson on Nov-22-2002: **
“You are correct in stating that the Pope exercises his charism of infallibility not only in dogmatic definitions issued,
ex cathedra, as divinely revealed (of which there have been only two), but also in doctrines definitively proposed by him, also
ex cathedra, which would include canonizations (that they are in fact Saints, enjoying the Beatific Vision in heaven), moral teachings (such as contained in
Humanae vitae), and other doctrines he has taught as necessarily connected with truths divinely revealed, such as that priestly ordination is reserved to men.”
Ecumenical Councils confirmed by the Pope can proclaim, and many have, infallible dogmas and doctrines and one example is the dogma on the exercise of papal infallibility in *Pastor Aeternus *of Vatican I
Such a presumption fails utterly to understand and obey the leaching of Vatican II and Saints John XXIII and John Paul II. The attitude and ability of offering the truth to others is mandated to the best of our ability, which skill can be learned and developed in apologetics.
See:
"Be A Catholic Apologist - Without Apology" | Carl E. Olson
Extract:
‘Catholic apologetics is the defense and explanation of the teachings, beliefs, and practices of the Catholic Church. Its goal is to remove objections, shed light on difficult or misunderstood matters, and ultimately help win minds and souls for Jesus Christ. Apologetics is the activity of helping people answer the question: “Why should I be Catholic?” It does so by engaging the mind to reach the heart.
‘The new evangelization promoted and articulated by Pope John Paul II emphasizes the importance of ordinary Catholics sharing their testimonies of faith with others. Dry facts and logical arguments may leave many people cold, but few cannot resist the story of a soul transformed and made anew by God’s grace. In this way the exhortation of the first pope can be realized in the life of every Catholic: “Always be prepared to make a defense to any one who calls you to account for the hope that is in you, yet do it with gentleness and reverence.” No apologies necessary.’
ignatiusinsight.com/features/ceo_apologetics_oct04.asp