Indiana was the first state in the US to enact laws of enforced sterilization in 1907. Churchill noticed that, and considered it in 1910. So what.
If it wasn’t for his leadership in WWII, the world would be a terribly different place today.
There were other principled men that stood alongside America who opposed Churchill in this.
He cannot go and say that it was the ‘spirit of the age’ that was responsible. Other men made other choices from the exact same spot as Churchill.