> Sounds like it's safest for me and my family to physically prevent you from doing that. See how deranged this line of escalation is? How sick in the soul I would have to be to choose to harm your family to increase the safety of mine?

I wouldn't throw stones, we all live in glass houses. Pedestrians (and cyclists, etc.) could say the exact same thing about car drivers - they're putting their lives at much higher risk by not biking (or using a motorcycle, or public transportation, etc.). Heck, drivers are also endangering pedestrians' children through global warming. If you really tried you could probably name a dozen more examples of ordinary people like yourself putting others at risk for their own benefits.

This isn't to say the parent's decision is great, but that this sort of counterargument isn't all that strong, either.