It is indeed the duty of historians to stress the contrast between the standards of the past and the… — 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.