Will you interfere with people that interfere with nature?

Suppose that you have a vacation in wilderness. There is a deer in your location that you can see and suddenly out of nowhere a cougar attack the deer and about to land the finishing bite. Apparently, there is a couple of people near you that saw this situation as well and about to drive the cougar away because they pity the deer. Will you interfere with them?

Even after you’ve explain that the cougar needs to eat and it probably has its own family that require food too the couple don’t care and still want to drive the predator away as they pity the deer. Will you actually prevent them from doing their thing? Or will you let them save the deer? I did mentioned the situation about a deer and a cougar but it can easily be between any wild animals (such as between a wild cat and a baby wild bird, etc).