The vast majority of Muslims are good people due to good parenting. I guess the good parents 'did not force' the deranged radical elements of the surrounding culture on the children.
Most victims of such sick cultures acquire it helplessly: some parent figure forced it on them in the guise of something - maybe tradition, maybe religion.
Vast majority of muslims are not really surrounded by a sick culture as you imagine from outside or what you watch on TV. For example, Turkey is a 70M country. There are surely sick (or radical) religious sub-cultures in Turkey but I don't think they are more than 5% of the population. Most people are nice people trying to have a happy life. Not much different from American people. And they would not turn into suicide bombers even without good parents.
The statement doesn't mean you have no guardianship of your children. You do but not an ownership of their future.
The next statement, "They are the sons and daughters of Life's longing for itself", explains that, and so does the rest of the quote.
I realize we have almost taken the quote out of its context. It talks about the children's future - their dreams and aspirations.