I thought I explained it. If a supposedly unchangeable Liturgy could change, the expectation was that anything could change. Why was it the the largest mass exodus from the Catholic Church in the west began after the introduction of the new Mass? 
Prior to the Council there had been no worldwide rejection of Casti Connubii, after the Council there was a worldwide rejection of Humanae Vitae not only by the laity but by many clergy, too. Something obviously had happened to persuade people that this doctrine could be changed. Since then the whole moral and ethical teaching of the Church is being increasingly challenged most noticeably that on marriage; on the fact that it can only take place between a man and a woman and that it is indissoluble. Is it just a coincidence that all this has occurred since Vatican II?
I say we have good cause to be anxious, considering what has gone on over the last half century.