Well, when you wrestle with a pig in the mud, the pig just has fun and all you get is dirty.
Alternatively, imagine a bystander just being there filming, and we're seeing footage where he's proceeded and run it over. We'd surely be running out of poop to push through the fan, and Metro would undoubtedly be tap dancing around that scenario. Or, if they told him to, imagine the story - Metro advocates running over dog on track.
Point is, the drivers made judgement call, and there's always going to be some who'll differ with the choice they would have made. No one can call the guy heartless. I'd buy him a beer too, and I'm not a big fan of dogs. I'm certainly NOT going to judge him for it.
Publicly i recon he'll get a "well done", privately he may get something else who knows.