To them the ends justify the means. Kill a few millions to save billions. Right and wrong is always the hardest thing for humans to struggle with in survival situations.
You ever hear of the true story of the William Brown a cargo ship of immigrants that sank in 1841?
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51 out of 65 passengers died. College professors love to use stories like this as to try and show that morality is subjective and debatable. The simplified version is you have 8 people on a lifeboat. You have food and water but only enough to last at best if rationed for 3 days for 4 people. The professor now turns to the class and asks each individual person what he or she would do.
By the end of the experiment you will hear everything from canablism, throwing people over, to risking the life of all 8 to try and wait for help.
Here was the actual story just in case your interested.
https://www.dailymail.co.uk/news/ar...-A-new-book-poses-ultimate-moral-dilemma.html
But this is the reality of those who truly believe this. Except Earth is the lifeboat and mankind is the overpopulated lifeboat. Powerful people like Bernie Sanders can use this knowledge to his advantage and tell the 4 people I will solve the problem for you. If you listen to me and throw in the other half then we will all be alright.