As mentioned above, the only purpose of the purge, according to legend of the game, is to search for relics. But the purge has not yet looked for any relics and has not engaged in robbery, it has simply stupidly committed genocide. Sorry, genocide of first comers and robbery are slightly different things. Even the most inveterate scoundrels do not kill the first people they meet.
The new purge is more logical: robbery comes first, and murder and destruction come second. Moreover, it is not wandering thugs who are doing this, but soldiers of the Empire sent specifically to take away treasures.