First, I am a Newbie to this blog and want to thank you all for allowing me to join.
Wow, this is an interesting thread and having used a predator call over 30 years ago, calling Fox, Coyotes, Bobcats, Wolves, and Deer; I quit using a call when I picked up the camera. By the way, Predators actually get used to the sound of a call real quick and more specifically, to individual calls; and these call-wary Predators will refuse to come in and even ignore the call.
I do not believe it is ethical for a "photographer" to use a call to coax animals in for a close pic or even so the animal shows itself. I get a ton of satisfaction from getting my pic and departing without alarming the animal. There seems to be both sides to the argument and I look at it like religion and politics, there will be different opinions. I guess I just don't believe it is sporting or right to use calls to lure animals in for a photo, but then I don't bait or take pics of birds at a feeder either That's just me and I respect other's thoughts and feelings as well.
(The young Doe pic was feeding by the road and had raised her head to see what was there; I was behind the other vehicle and quietly shot a number of pics with a 150 - 600mm from a window beanbag, and eased away as she returned to her meal).