That's survivorship-bias, which is something to watch out for. I'm better off because of Hitler's existence, because he genocidal rampage is what brought together my grandparents. I'm better off because of the Black Death, because I benefited from the resulting Enlightenment.
A bad system can look good to those who thrived through it.
You are better off because of the black death... those with the wrong genes were eliminated.
Sucked at the time, but it was for the betterment of the human race... that's different though, because it is nature taking charge (and why I don't worry about over population).
Had this thread already been Godwinned? Or did you take it? And, well, is it so bad to look for silver linings? It doesn't mean the word is better off, but if it was because of WW2 that you got to be you, that's good for you... you didn't ask for it, you were a 2nd or 3rd hand repercussion.
Anyhow, the Romans were pretty awesome, they innovated... it's not just sheer happenstance that they came to rule. There are so many contributions to today that we benefit from... just to list a few: jurisprudence, clean water/plumbing systems, the alphabet we all know and love, making European languages similar which lead to increases in achievement for centuries due to the easier transfer of knowledge, organizing warfare better, etc, etc, etc.
I guess what I am getting at... "suvivor-bias" is kind of a lame concept in the context of the Romans.