Someone please correct me if I'm wrong, but I think Diesels are much safer than gasoline engines? Because, Diesels require compression to ignite unlike Gasoline, no? Please correct me if I'm wrong.
A spill of diesel is less immediately dangerous than a spill of the same amount of gasoline, but will still burn if it has a wick (you don't want your clothes soaked in diesel). But it's quite rare, I believe, as fuel tanks are well protected, so I don't think it translates into a statistically significant difference in safety between cars running on these different types of fuel.
I don't think that statistics agree with you. The most dangerous thing about driving around in a car is getting physically smushed in an accident. Gasoline fires injuring people are much more rare. So it doesn't significantly change overall safety that gasoline ignites more easily than diesel.