To be more accurate I should have said breaking my carboy was more easily avoidable than I thought before. I saw a very specific reason I broke it, and it wasn't a 'freak accident', I just wasn't paying attention to the things near me as I was cleaning. Now that I know what made it break, it won't happen again.
I know the motorcycle quote, and I ride bikes. It is kind of true. Same for driving a car (you'll hit something you didn't mean to, eventually, even if it is just a curb; not necessarily another car on the street) or walking (you'll do it wrong sometime, and scrape your knee or twist your ankle, but not necessarily fall off a cliff and die). I'm going to make a mistake brewing, yes, but I am confident it won't be a mistake that will cause me to break a glass carboy, or anything else I'm not willing to risk.
Life is risky (for happy people), if we never did anything that people die or get hurt doing on a regular basis, we would never do anything at all (and not be very happy).