Harry wasn't there to save them, because you weren't there to save Harry.
6 seconds sound clip from the It's a Wonderful Life (1946) movie soundboard.
You can hear this line at 01:58:56 in the Blu-ray version of the movie.
Quote context
[...]
- Your brother Harry Bailey broke through the ice and was drowned at the age of nine.
- That's a lie. Harry Bailey went to war.
- He got the Congressional Medal of Honor.
- He saved the lives of every man on that transport.
- Every man on that transport died.
- Harry wasn't there to save them, because you weren't there to save Harry.
- Clarence. Yes, George? Where's Mary?
- Please, Clarence, tell me where she is.
[...]