Nobody says that paladins are the best killers.
But the game is not only about number of kills.

If a paladin comes to my cabal, slays all guardians, beats me, takes my item,
even if he didn't land a killing blow I would not be the happiest person anyway.
I didn't die, right, but still I may be demoted, for example, for laziness
and a lack of ability to defend by clueless elders.

P.S. Perhaps you will laugh, but my last PK death with Nabburak was to a paladin using lagging strikes ( and gang ).