Well, the just subject of this post ought to elicit some strong responses.
I've always seen, and agreed with, the opinion that shooting from the back of a safari vehicle is unacceptable and unsportsmanlike.
However, we all know that there are no absolutes in life. So, the question is not really if it is ever OK, but when is it OK to shoot from the truck? If you saw a very sick or injured animal, that you could not approach on foot, would you shoot from the truck to put it out of its misery?
I once found myself in a situation where I finished my hunt early, but had a few days until my flight home. The first thing that happened was that the manager (who was also my PH) told me that they needed some meat for the staff and we'd go out and shoot some. To give a little more context, it was a late season hunt 9early November) and the vegetation was leafing out, so visibility was becoming a problem.
We drove around until we spotted a gemsbok. It was an old, mature bull with a broken horn. Out came the guns and we had one gemsbok for camp meat. After lunch, we went out again and this time, it was a blue wildebeest. In both cases, the elevation afforded by the truck made it quicker and easier (possible?) to make the shot. They had a hunter coming in a few days for a leopard hunt and needed bait. So, warthogs (his preference for bait) were next on the list.
So, by this point, I'm pretty sure that many folks are already thinking about how strongly to word their flaming response. But, seriously, how wrong was it? These animals were not taken for sport. It was just a job that needed done and shooting from the truck was the most efficient way to do it.
Have fun with this!