It could be other things other than a fear of responsibility,
although I agree that it may be a case of the aforementioned. I'm
afraid of having children, Not because I'm afraid of the
responsibility in having & raising a child, but I'm afraid I
may Not make a good mother.
I have a severe lack of patience for a screaming child, especially
those throwing tantrums, & I certainly don't wish to smack my
crying baby/toddler. Babies are extremely adorable, but when
they're screaming right in your ears & hitting & kicking
you, & generally making a nuisance of themselves in public, it
grates on the nerves TERRIBLY 
FeowFeow
