In its words, rubrics, and aura the liturgy teaches the faithful more powerfully than any book or person. Correct doctrine and consistent practice in worship as well as in the catechetical mission of the Church is important for the very existence of the Church. There is an old Latin saying, lex orandi, lex credendi. The saying makes the point that what we pray and do at worship affects what we believe. The relationship between doctrine and liturgical practice is important.
Bad theology makes for bad liturgy and weakens faith.
It is also correct to say that bad liturgy makes for bad theology and weakens faith. They do not want to lose what has been gained. They know that it takes time to develop quality and taste in liturgical matters so that they can participate better. Recall the aims of the Second Vatican Council cited above and reflect upon whether the loss of vocations and widespread disbelief in one of the most central tenets of the Catholic faith are the manifestations of those aims. It seems odd that the reformists are spending an awful lot of energy attacking those of us who are advocating the use of the 1962 Missal.