I wrote about this in a comment and I thought I'd share it here. I couldn't find the alternate version where Armstrong gives this introduction:
"Some of you young folks been saying to me, "Hey Pops, what you mean 'What a wonderful world'? How about all them wars all over the place? You call them wonderful? And how about hunger and pollution? That aint so wonderful either." Well how about listening to old Pops for a minute. Seems to me, it aint the world that's so bad but what we're doin' to it. And all I'm saying is, see, what a wonderful world it would be if only we'd give it a chance. Love baby, love. That's the secret, yeah. If lots more of us loved each other, we'd solve lots more problems. And then this world would be better. That's wha' ol' Pops keeps saying."
Now, Armstrong was not stupid. In the 50s he got so fed up with Jim Crow that he angrily wrote to President Eisenhower and privately said that he wouldn't do anything more for the US government unless they addressed racism. But I believe that he was sincere when he spoke this introduction. The world is beautiful. We just fuck it up sometimes.