Regardless of the obstacles faced in the second half (which are still more numerous than the competition's), can't you understand why runners would still look back at that first half to explain their fatigue, anger, and feelings of injustice? Particularly when looking ahead and thinking, "Oh God, this crap /again/??"
The marathon in this example actually spans multiple generations, but even the horrible segregation of the 50's was experienced first hand by the parents of black people still in the workforce today.
Sounds like you came into the race halfway through. As an immigrant you're still facing those unfair obstacles in front of you, but just remember that you don't have the fatigue of carrying the baggage from the first half.