With all due respect - I guess you can "kill" something or your can "take" it's life... Semantics at play here, but that does not seem to be what bothers you. To be sure this was not some ,"Stand here and wait as I call my tame pet kitty to come over so you can shoot it," type of hunt. As you can see from the picture, father and son were hiking in the mountains with many feet of snow as part of a sanctioned and permitted Cougar hunt/cull in the Interior of British Columbia. Nothing to get worked up about, although I appreciate your point when applied in different circumstances to these. (Shooting animals inside fenced areas, animals that are tied up or raised tame from birth, etc...) Since moving to the states I have not been able to hunt a deer from a stand since that just doesn't feel right to me, but I get that with mostly private land down here you just can't simply take off on your horse or ATV and go find you a big Buck after a 3 day chase. That is how we did things back home, but a good way to get shot yourself down here with all the private property.
Using the word "harvest" or "take" is appropriate in my opinion to those who hunt a lot and are not looking to brag about "killing" something. We don't kill just for the sake of killing - there is always a reason or purpose. Have you met anyone who jumps up and down claiming they "killed" a lobster or a "cow" while chowing down at the restaurant? When hunting with Native American friends, the experience becomes even more somber and spiritual. Recall the great deer hunting scene from the movie Red Dawn for some background there.
Here is some info on cats in Canada:
Canadian Cats - International Society for Endangered Cats (ISEC) Canada | International Society for Endangered Cats (ISEC) Canada
Also - if you have never had a Cougar steak you are missing out.
Cougar Meat Recipes
Sorry for the rant. I mean no disrespect, but I had to defend my honor.