I did not see any giggling or laughing at the actual event.
I suspect you have seen a shortened clip of this crime. Indeed, there was a lot of laughing, from the time when she says to him - "tell me when" - he is holding the camera and getting into focus. The dog is looking up at her, sad and anxious. She is delighted, and just can't stop chortling.
She shoots the dog again and again. One of the disturbing features of this crime is that a US army service member can't even effectively shoot a dog at close range. Then they swap roles, she holds the camera, and he goes in and shoots the dog, with a larger rifle, in the back of the head.
She shoots the dog again and again. One of the disturbing features of this crime is that a US army service member can’t even effectively shoot a dog at close range. Then they swap roles, she holds the camera, and he goes in and shoots the dog, with a larger rifle, in the back of the head.
I saw a short clip where she shoots the dog several times, very rapidly. It is obvious the dog is dead.
Then, there was another short clip where someone else shoots the dead dog, probably just to be make absolutely certain that it is not wounded.
I did not hear any sound, maybe the clips that I watched had the sound turned off.
It seems likely that someone broke the original video into a number of short clips.
Maybe they get more clicks that way.
Nothing on earth will trust you more than your dog does.
Betraying that trust is a sin of great magnitude.
They are much like innocent children, in that sense.
Anyone who would harm a child or dog is the worst that wretched humanity has to offer.
Anyone who applauds or attempts to justify this sadism, is beneath contempt and a passive partaker in the killing.