"I think that world conditions were a lot worse during World War Two."
...and just about anytime before that.
Take a look at population explosion in the 20th century. Mortality went down and continues to go down, like never before the 20th century. Standards of living are better than ever for everyone. Famines are almost non existent (obesity is the new problem). Wars are pretty much restricted to few civil wars in few countries. Longevity keeps going up.