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Let me give you a couple examples of my own personal development.

Initially I thought that I would never allow my girls to wear ANY makeup.  I considered it to be wanted by girls only for impure purposes.  I grew up with 3 brothers and was out of the house when my one young sister got older (she was 8 when I was gone).  And my mother never wore makeup ... not out of principle, but just because she never felt like it.  I have four daughters now, and both the older ones, when they hit puberty, developed acne (inherited through their Mom's side).  And I was shocked by the degree to which they were derided by their Traditional Catholic female friends.  They asked if they could wear some stuff to cover up, and of course I let them.  Nothing heavy, but just enough to make them feel not "repugnant".  Imagine if I had stuck to my guns, as some Traditional Catholic parents had done, and they spent years and years feeling "repulsive" to other people.  That would cause severe emotional and psychological scars for a girl.  So I came to the realization that there's nothing inherently wrong with a girl just wanting to feel pretty.  And I also realized that 99% of the time, it was in relation to their FEMALE peers, that they wanted to feel pretty, and not because they were trying to "ensnare" some boy.  So as long as I don't sense any impure motives, I let them wear some light makeup, just so they can feel pretty.  And I let them wear nice clothes (provided they're not in any way immodest) ... instead of imposing the "Little House on the Prairie" look that many Traditional Catholics require of their girls.

But sometimes, even when they do get this from their parents, they seek a more intimate type of love/acceptance from the opposite sex.

Yes, in this case it's more of a "black sheep" mentality or an adventurous spirit in the child (i.e. a choleric who likes to challenge the rules).  But...i've never seen a child who had a good relationship with their parents give up the faith totally.  Yes, they could make some horrible decisions and screw up their life immensely but they wouldn't give up religion (or at least not due to hostility.  They could give it up due to laziness or for pleasure, but that has nothing to do with the parents and this kind of reason can be overcome by grace - see St Mary Magadalen or St Augustine.  But when a person gives up religion due to hatred or "rational" reasons, only the grace of God can overcome this strong emotion).

On the contrary, i've seen some kids (some relatives) who had a bad relationship with their parents (both parent/child were to blame) but otherwise had a great childhood and they gave up religion even though they never did anything crazy or extremely stupid.  They were just "blah" towards the whole idea of God.  This, of course, was a gradual process, but their foundation for loving God was greatly compromised by their disfunctional family.  (Again, this was not all the parent's fault).

Then you have the case of the loving parents but who are strict, not in the sense of not allowing freedom, but who are just "control freaks" and don't know how to "let go" and let their children legitimately experience AND FAIL at life.  They don't know how to let a 13 year old decide when/how to do their homework and face the consequences at school (the parents continue to micro-manage the teenager just like they did when he was 3 or 4).  If parents don't let their kids make dumb decisions at a young age, they'll make them when they're out of the house at 18 or 20.  You can't avoid dumb decisions; you can't avoid life lessons.  Failure is the best teacher there is.  But you have to let them fail in a controlled environment or else they will fail when no one is around and the consequences are more extreme.

Then there are some kids just have to go wild to figure out the limits of life and experience first-hand the idiocy of their ways (i.e. Prodigal son, St Augustine, St Mary Magdalen, etc).