Deer are the 2nd most lethal mammal in North America, after Homo sapiens. Striking one with a car is a very well-known way to die.

That is NOT why there are so many accidents.

What's your next theory, people hunting children playing ball is why so many children get struck near playgrounds?

Are you saying that people intentionally strike reindeer with their automobiles?

That sounds far-fetched to me, but I could also see it as a form of dangerous poaching.

They make tasty snacks.