They wanted peace and they fought for thirty years to be sure of it. They did not learn then, and have not… — Norman Davies

Ch. 7: Renatio (p. 556)

There are shades of barbarism in twentieth-century Europe which would once have amazed the most barbarous of barbarians. At a time when the instruments of constructive change had outstripped anything previously known, Europeans acquiesced in a string of conflicts which destroyed more human beings than all past convulsions put together.

Arguably, the only fruit of the Crusades kept by the Christians was the apricot.