My best friend died earlier this year and while I was pretty sure of the cause of death anyway, when an autopsy was done on her, it confirmed certain things. It was hard having to wait 12 weeks for those results after she passed away though.
I'm of the thought that what happens to my body after I die is no consequence to me. I don't believe in a 'soul' as being anymore than an emergent property of a physical brain. Once that's gone, who cares about the body that held my brain for all that time.
I would be horrified if anyone I cared about had their body treated disrespectfully after they died, but I don't consider an autopsy, organ donation, a body donation for science or so forth disrespectful at all. A good friend's uncle died recently and his wish was that his body was donated to science - there was a comfort to his family in this, in that he'd kept on giving, even after death.
I personally can't see anything wrong with a body being donated for science and the opinion that this is somehow weird or wrong honestly baffles me.