Let's say you have two infinitely large pitchers, and an infinite amount of water to pour into them.

Every day, you pour some water into the pitchers: one gallon into the left pitcher, and one ounce into the right pitcher. After doing this every day for over a hundred years, there's quite a discrepancy in the amount of water in these pitchers.

Then, one day, you decide you're no longer going to pour different amounts. From now on, you'll pour one gallon into each pitcher every day. Exactly equal and perfectly fair, right?

Except, if your goal is to get the same amount of water into each pitcher, you're never going to accomplish that this way. And then someone points out that the right pitcher is still a hundred years behind the left pitcher, and you reply with "well what do you want me to do about it? I'm pouring the same amount into both now."