I think Vatican II helped weaken church standards and discipline and thus helped laid the groundwork for the homosexual pedophile priest scandal.
The US seminaries at the time of Vatican II time were half-full or more of homosexuals, and previous classes had yielded their share of homosexual priests which had replaced the aging Irish and Belgian priests sent over in the 1920`s. The diocesan stats for 1950-70`s show that trend of priests being transferred around, wheras from 1840-1950, almost 100% of priests usually retired or died in the first parish they were assigned to, or they retired to their home countries in their 90`s.
I did research on this when I found out that several priests were known to be predators and were merely transferred to other parishes in the late 1950`s and early 1960`s when I was doing community liason work for the local bishop as a college project and had access to the Chancery records and archives.