Spoiler Thread: Avengers Infinity War

Thanos is not responsible for the fall out of what he did. He removed half of all mortals. His job was done, anything after that is merely collateral.

Of if you want to consider it, then he snapped away exactly the number of people we needed to, and the collateral brought the total to half.. Because it is the infinity gauntlet. He has all of the knowledge in existence, he can see the past the present and the future with the time stone..

Also you do nothing with that information, as far as you know it is a prequel.

At least now these folks can ride inside the train.