“Why is today's parenting producing youngsters with so little resilience? “
Quick answer, it’s not. It’s likely you have come to this incorrect presumption due to social gossip rather than science based fact.
Longer evidenced based answer.
This question is fundamentally about human biology & development. Unless you believe humans are comprised of some “alternative” mystical substance than biology, in which case the scientific research can’t help you find your wish.
So as not to come across as being arrogant let me say that every statement written here is based on research that I did not perform my self. i.e., I’m just inferring the general scientific consensus and have no social axe to grind on this issue (unlike many on social media it would seem). In fact thousands of researchers and the scientific papers they produced over the last decade or so have shown that parents don’t influence their children’s key characteristics (psychologies) any where near as much as do the genes that the children inherit. i.e. Jonny doesn’t grow tall because his parents taught him how to grow tall, he grows tall due to good nutrition and the genes he inherited. Likewise, Claire inherits a potential for above average intelligence & with the right nurture (e.g. by parents and culture) Claire can develop and express her above average intelligence. Though, if Claire got her intelligence more from her, for an example, grandfather as genes are inherited in discreet “packages” not specifically a mix of both parents and Claire’s parents don’t perceive that their daughter Claire is above average intelligence, eventually (other things be equal) Claire will develop her intelligence regardless of her parents. i.e. The parents of children have a limited, short term effect on the type of Adult are child will be. So to be clear, of course Parents can/do make a child’s childhood a happy or sad time. But the parents teachings etc have no effect on the child’s innate personality.
A good laypersons book which summarises the overall research is ‘Blueprint: How DNA Makes Us Who We Are’.
www.goodreads.com/book/show/39074555-blueprint?from_search=true
“In Blueprint, Robert Plomin, a pioneer in the field of behavioural genetics, draws on a lifetime's worth of research to make the case that DNA is the most important factor shaping who we are. “
There is no Nature V’s Nurture. The genes develop a human whom will express their “true nature” under differing environmental circumstances.