I remember when my first child was born and a dear family came up to the hospital to visit. I let their children hold my baby while my mother-in-law looked on in horror, even to the point of trying to take my baby from me to prevent me from letting the children have a hold.
I remember watching new mothers not let other children anywhere near their precious babies for fear they'd give germs to their little one. Here I was telling kids to come see, touch, and even hold my baby.
I would also notice that when babies would drop their dummy/binky/pacifier, the new mothers would run to a hot water tap to sterilize it or have a clean one ready and waiting. Here I was picking up my babies binky, sucking it off and handing it right back.
I love seeing kids come in from play all covered in dirt. It means they've had fun. Let them pick up bugs...I've even retrieved a few from between teeth.
My husband hated when I'd let my children go outside to play without wearing shoes. When it came time for them to ride bikes he was even more mortified that I allowed them to ride shoeless. When the kids would come home with skinned toes he'd think that proved his point and couldn't believe I'd kiss them, wipe their wound and send them out again without shoes.
The point is...my kids survived. They don't remember the scrapes and the scars they do have my boys think are 'cool'. Here's a link to a blog that talks more about dangerous things we should let our kids do.