A pedant writes: it's not really true to say that Brooke was killed - that implies he met some sort of violent death. He died of blood poisoning following a mosquito bite
Indeed.
How about Brecht's "What is the robbing of a bank compared to the founding of one?" Written about 10 years before Grapes of Wrath and equally appropriate today
Love the closing lines of Middlemarch
" ... for the growing good of the world is partly dependent on unhistoric acts; and that things are not so ill with you and me as they might have been, is half owing to the number who lived faithfully a hidden life, and rest in unvisited tombs.”