Consider a worst case scenario:
Person A is a fit cyclist
Person B is a sedentary obese person

Person A dies after being run over by person B.
Person B dies a few years later of complications due to a sedentary lifestyle.

Now I ask this: if you were to choose the way you were going to go, wouldn't kicking it while doing something you love beat Person B's life ending experience?

Of course, I actually intend to die in bed with my lovely mistress at the ripe age of 110.

Just the one mistress?

hey man, these things roll over all the time. if you're careful, you'll be OK but if you try to push it when you're cutting a hill (even a slight one) and are driving at an improper angle to the hill, these things roll.

It's just a risk to look out for when using them. Some people don't and hurt themselves

Just checked, and not only are there about 75 deaths of people from using ride on lawn mowers (as compared to 64 deaths a year of cyclists), ride-on lawnmowers and lawn tractors injure more than twenty five thousand people every year (in Canada).

Also, (I like this), a British study, based on 1999 data, found that: far more Britons were injured by magazines (4,371) than chainsaws (1,207) ; accidents involving tea cozies jumped to 37 from 20 the previous year; there was a rise (to 5,945 cases, up from 5,137) in hospitalisations for men who suffered "trouser accidents"

So really, if you're worried about riding your bike, you can be hospitalized, sitting in bed, reading a magazine, having tea too.