The Difference Between Physicians and Veterinarians?

This came up today at lunch in a conversation with my friends Stacey and Sue:

I have worked with hundreds of students whose dream was to complete professional school and become veterinarians or doctors.

When I have asked pre-vet students why they want to become veterinarians, the first response is almost always, "Because I love animals."

When I have asked pre-med students why they want to become doctors, NO one has EVER responded, "Because I love people."

What is that about?