Every now and then a “document” is issued from the hierarchy - a Pope, the Vatican, a Council of Catholic Bishops, a Diocese - affirming again the importance of catechesis and right formation in the Faith. The documents are dutifully entered into the library of Church Documents, and all remains as it was before. Most in the laity are never disturbed by reports of such violations of parish tranquility.
My personal answer to the question, “What is the cause of poor catechesis,” is the absolutely firm and unbreakable commandment that parish tranquility must not ever be disturbed. Status quo must be maintained. Horrible things might happen…
It will take divine power to upset the apple cart. Come, Lord Jesus! Holy Spirit, fill the hearts of your people - kindle in us the fire of your love!