Just because a man (or women!!) works his dogs, does not mean he has to have a heart of stone, compassion is what makes us human, no shame in admitting it broke your heart, you would not be normal if an incident like that did not tear you to bits emotionally.
Barbed wire is lethal, many people do not give it a second thought but then they do not own dogs that can run at high speed.
Sorry to hear about peoples barbed wire stories and losses