I didn't vote because I've had several cats over the years.
When I was a kid we had an outdoor cat, she live about 8 years and was killed by a dog.
Another cat as a kid, outdoor, poor thing didn't live a year, was poisoned by a neighbor.
George live 8 years, indoor/outdoor, died of complications from diabetes (was being treated)
Muffin live 14 years, indoor, died of natural causes.
I currently have 2 cats, indoor only, Dinah will be 8 this year (still acts like a kitten) and Bailey will be 5 (also acts like a kitten).
My cats will always be indoor only, by my own observation, I believe indoor cats can lead just as fulfilling lives as outdoor without the added risks.