Analogy time! This time, with the help of animated Disney movies and their respective sequels.
Parents/adults like us (who grew up within the 70s-early 90s) are like the protagonists of the first adaptations of a Disney classics (let's use Lion King, The Little Mermaid, or The Lady & The Tramp for example). As kids, we had a variety of different experiences, we got hurt a lot, got into trouble, put our parents and loved ones through hell, and generally did what we wanted to do. All in all, our wounds healed, our bones grew back, learned a lot of stuff as we got older, and generally toughened us up for the challenges that we would face as teens and adults.
Some parents/adults today (who grew up in the early 90s onward) are like direct-to-video sequels of the aforementioned films (Lion King 2, The Little Mermaid 2, and The Lady & The Tramp 2). Kids nowadays are just as curios and rebellious (at times even more so than the previous generation), but their parents are cautious, control freaks. They themselves are aware of the dangers that they went through and do their best build a Styrofoam world for their kids to be safe and free from any form of harm. Kids are going to grow up as weak, sensitive naggers that will learn that if there a problem, they can just complain until it goes away rather then face it themselves or powering through it.
I can see the need for concern for some things that these parents complain about, but kids need to go through some of the same stuff we adults did so that they can experience/solve these problems themselves and even come up with newer experiences/solutions to problems that we may not have had/thought of when we were growing up.