I won't ride without one, but am in agreement with the idea of personal choice, and believe it for seatbelts too.. as far as child seats.. no, we have many incompetent parents that don't have the ability to make decisions to keep their children safe, so safety measures should be mandated for children.. and ENFORCED.
I ride with Helmet, Gloves and Armored jacket, and when I'm on a long haul, I wear the armored pants too. It only takes one small unprotected accident to lose your life, and I have too much to live for.
Case in point: Navy Surgeon General is in Bethesda Navy Hospital recuperating from a motorcyle accident. He rear ended a car on highway at 65 MPH. One reason for survival is the type of bike he was riding, the front suspension was made to throw him up and over the car he hit, then the clothes he was wearing took the fall, and the skidding on the pavement. 10 - 15 years ago, or even a different bike would have been a fatal.. and 10 -15 years ago, he probably wouldn't have been wearing the gear that saved his life. If he was wearing only a helmet, I believe he'd be dead now too. he got beat up, a few broken bones, a fractured pelvis, but he survived, and will be back to normal in a few weeks.
The way the newer riding gear is made there's really no reason not to wear it other then cost. It's comfortable, and it's vented and it's armored in all the right places.
ATGATT, All The Gear, All The Time..