There would be more kids left disabled or permanently harmed from these diseases, even if they did survive.
I've heard these 'common sense' views before but they're unscientific - the immune system doesn't get stronger from exposure to disease. It doesn't need to be exercised.
Hitler did the same thing, except he blamed mostly Jews and communists. He had his own personal thug army to intimidate the media, beat up people opposing him and cause violence on the streets, which he then 'had' to solve...by grabbing power.
He burned the Reichstag down and blamed communists, used it as an excuse to grab more power and become a full on dictator.
Then he killed anyone opposing him.
@VisualStuart
Is the 'immigration agreement' so that natives will hand over any immigrants who try to flee to the reservations?
Do natives get to decide who lives on the reservations? Would someone need papers to live on a reservation?