Well, he/she without sin can cast the first stone. Haven't you ever made a mistake.... The officer probably thought driving over the animal would be the best way to end its life. It wasn't.
The thing with video, it doesn't show the whole story. eg those videos of cop shooting people (mostly black) down in the states.
The human race has been killing animals since the beginning of our existence. And will continue to do so in the future. Anyone wonder where that chicken/beef comes from in the grocery store/restaurant.... Somebody killed it, so you can eat it....
Some people need to grow thicker skins... life is brutal, and not fair.
We are talking about euthanising a wounded animal in Canada...not about LE defending themselves against an assailant , or abusing their authority in the US.
It is law in this country to end an animals life in a slaughter plant as humanely as possible.
Poultry I'd electrocuted , beef and pork are put down with a reusable bolt gun.
It falls under the Humane Treatment of Animals Act in Slaughter and Transport.
It's not pretty......but it does, in my opinion separate being merciful from being savage.
Many deer that survive the impact of a vehicle, but are wounded, are eventually killed by predators....Mother Nature is an efficient old bitch.