The War on Britain's Roads (BBC Documentary / tabloid tv)

Ultimately yes, but environment does have an affect on behaviour, and what you ride/drive is a small part of that.

In theory I suppose it's more tempting to "go for it" or "take calculated risks" if you're fast. However, the solution to the problem is not cast-iron bikes and Ford-Ts respectively; it's the culture and mentality that needs to change.