Phil Ochs says it better than I can:
In every American community there are varying shades of political opinion. One of the shadiest of these is the liberals. An outspoken group on many subjects, ten degrees to the left of center in good times, ten degrees to the right of center if it affects them personally.
The issues have changed slightly from the 1960s, but his song’s accusations of hypocrisy and NIMBYism among those who publicly espouse progressive causes still hit close enough to home.
Historically, it’s been alleged that some ‘celibate’ Catholic bishops fucked women. When the resulting bastard children grew up, they were rewarded with coveted Church appointments. If anyone noticed the apparent favoritism, they blamed the adultery on their brother, saying the appointee was a nephew (it: nipote) rather than the priest’s own illegitimate son. Thus the origin of the term nepotism.
Probably some of them had different tastes and realized that fucking boys leaves less evidence.