Imagine a hundred runners entering an insanely long footrace. Before the race starts, the official says that due to his complexion, one runner will start running at the second gunshot, and the other runners will begin at the first gunshot. The darker skinned runner contests, but those are the rules and if he wants to race, he must follow them.
BLAM
The palest runners are off and running while the other one anticipates the second gunshot. He patiently waits, but it doesn't come. After ten minutes, the runner complains to the official, but he repeats that these are the rules, and if you just wait patiently, it'll be your turn. After an hour the crowd is outraged by the injustice and begin to protest.
BLAM
The official fires the second shot in order to deescalate the situation and prevent the stadium from being torn apart. The runner is off and he is determined to gain as much ground as possible as the other runners.
At the end of the day, the runners meet up at a checkpoint to rest before the next section of the race. When they announce the official times, the darker skinned man is 50 minutes behind the other runners. He mentions to the officials that he had to wait an hour to start, and that he would have had a better time than many of them if they had started at the same time.
Fine, they say, not wanting another scene like they had at the starting line, "from now on, all runners start at the same time." That's great! So, can I deduct an hour from my time?
WHAT!? WE ALREADY CHANGED THE RULES TO MAKE IT EQUAL. EVERYBODY STARTS AT THE SAME TIME! AND NOW YOU WANT MORE? THE OTHER RUNNERS DIDN'T NEED ANY TIME DEDUCTIONS!
I now see I went too heavy on the caps, but I'm not typing it again.
Anyway, DEI is the one hour time deduction. It's making up for holding them back for so long while everyone else was sprinting ahead. But, those other runners, they were so busy running that they don't know how long it took for that second gunshot to go off. All they see is a runner with a mediocre time getting a 1 hour deduction which moves him to the top 3. The guy getting bumped to fourth is REALLY going to feel cheated, and resent the system that gave that guy an hour just because of his skin color.