You sound unimpressed. But do you really feel you could take humans from all around the world and put them together without them trying to kill one another?
AFAIK, no one in my college killed any other student while we were there, whether they were citizens or on student visa.
At age 2 or 3, absolutely!
What happens when they're older is anyone's guess.
Maybe as long as there aren't any toys in the room.
Yes. I lived in San Francisco for years. The murder rate there is about 7 per 100 000 population per year. Does that qualify as "not trying to kill one another" in your book?