Well, they have to remove to body to further collect evidence or look for additional exit and entry holes on the body or the car.
I'm sure that when the workers in the photos first started their jobs, they were "respectful" in their handling of the bodies, but after years on the job, it's just that, a job, a routine to get paid and go live your own life.
To quote Horatio Walpole's original quote, "I have often said, and oftener think, that this world is a comedy to those that think, a tragedy to those that feel – a solution of why Democritus laughed and Heraclitus wept."