Come now – "a tricycle can become deadly"?
Many, many more people run over their children in the driveway compared to the number of kids killed by their toys.
Cars are the number one cause of death for children after infancy. When we complain about people worrying about stupid things, this is what they should worry about. More than half of all kids are killed by automobiles, far more than any other cause.
http://webappa.cdc.gov/cgi-bin/broker.exe (Center for Disease Control, fun interactive graphs about death and dying).
If a specific kind of car adds even more danger to this carnage, (hmm, a pun) I see no reason why they shouldn't be removed from the road. I'm happy to blame drivers, but I'd like to take dangerous tools out of their hands too.
Now, whether the issue of regulating the minuscule number of these exotic cars matters in the overall issue of traffic danger, is another matter. We should not focus on a few cars without looking at what measures would actually increase safety in general. But if these cars (and the people who chose to drive them) are costing other people's lives, I'm happy to take their keys away. Let them drive a tricycle, no?