Why We Shoot Deer In The Wild (As Opposed to Roping)

I had this idea that I could rope a deer, put it in a stall, feed it up on corn for a couple of weeks, then kill it and eat it. The first step in this adventure was getting a deer. I figured that, since they congregate at my cattle feeder and do not seem to have much fear of me when we are there (a bold one will sometimes come right up and sniff at the bags of feed while I am in the back of the truck not 4 feet away), it should not be difficult to rope one, get up to it and toss a bag over its head (to calm it down) then hog tie it and transport it home.