Nearly all of history is only a string of horrors. If tyrants dismiss it while they are alive, it seems that their successors allow people to transmit to posterity the crimes of their predecessors, in order to offer diversion away from the horror that they inspire themselves.

[Presque toute l’Histoire n’est qu’une suite d’horreurs. Si les tyrans la détestent, tandis qu’ils vivent, il semble que leurs successeurs souffrent qu’on transmette à la postérité les crimes de leurs devanciers, pour faire diversion à l’horreur qu’ils inspirent eux-mêmes.]

Nicolas Chamfort
Nicolas Chamfort (1741-1794) French writer, epigrammist (b. Nicolas-Sébastien Roch)
Products of Perfected Civilization [Produits de la Civilisation Perfectionée], Part 1 “Maxims and Thoughts [Maximes et Pensées],” ch. 8, ¶ 474 (1795) [tr. Siniscalchi (1994)]
    (Source)

(Source (French)). Alternate translations:

Nearly all History is a procession of horrors; but, although tyrants hate History in their own lifetime, a general transmission of such crimes is not unpleasing to their descendants, for it distracts attention from their own.
[tr. Mathers (1926)]

Almost the whole of history is nothing but a series of horrors. If tyrants detest it while they are alive, their successors seem willing to allow the crimes of their predecessors to be transmitted to posterity, to divert attention from the horror that they themselves inspire.
[tr. Merwin (1969)]

Almost the whole of history is nothing more than a series of horrors. If tyrants detest it while they are alive, it seems that their that their successors suffer that the crimes of their predecessors should be laid at the door of posterity, in order to divert attention from the horrors to which they themselves give rise.
[tr. Pearson (1973)]

Almost all of history is a story of horror. If tyrants condemn it during their lifetime, their successors seem to allow the crimes of their predecessors to be passed on to posterity, thereby diverting attention from the horror they themselves inspire.
[tr. Parmée (2003)]