Explanation: The Romans had an absolutely horrific capacity for taking casualties in the mid-Republic, and an equally horrific stubbornness that lasted all throughout the era of the Republic. Fuckers didn't give up. Didn't matter if they had to ban mourning, sell all their jewelry, free their slaves to fight as citizens, the Republic was determined to win or die, no third options.
Man, I wholeheartedly agree with the premise that Rome just simply had the capacity to lose. I think it may even be the largest contributing factor to the long decline of the empire. Kinda hard to maintain that capacity when it's all being spent on plagues and civil wars.