yetanotherchick - yes, you're right, there is a 99% chance that you'll blow up and crash badly if you're a B standard runner trying to lead the way to an A standard. That's why you don't do it. Because you worked your ass off to get to this moment, and the truth is that if you have the strength to pull off a miracle and hit the A standard by leading from the start (or close to it), then you also have the strength to pull off a miracle and finish the last 1/3 of the race so fast that you get the A standard no matter the pace up till that point.
But it's also the biggest race of your life. So if you can't hit the A standard, then you want to race well.
So you race smart. You go out with the pack, letting someone else do the work. Hoping you'll have that miracle in your legs.
And I'll bet that when that moment arrived, when it was time to go or miss the standard, the athletes in question recognized that they didn't have the strength in their legs - and we're happy to finish as strongly as they could.
Don't forget that there were heats.
Don't forget that leading a race adds seconds to your finish time (that is, it means that in order for say, Will Leer or Gabe Jennings to run a 3:36 from the front, they'd have to be capable of running around 3:33 that day - or maybe 3:31 given the wind on the backstretch ... and if you've never felt that wind in Eugene, you have no idea how strong it is).
It's easy to say someone else should have "gone for it." Except that this is the truth: they all did. They just didn't do it in the stupidest way possible - by running from the front. Instead, they ran smart and hoped to have the strength ... and when they didn't, they finished as well as they could.
You don't get to be a top runner by making stupid mistakes. And you sure as hell don't hit the A standard and make an Olympic Team by running like some high school freshman in his or her first big meet.