Shaolin Legandary Elders Great Power Comes with Great Responsibilty - Buddhism Zen
&quot;Proper means&quot; has nothing to do with the Buddha-Dhamma, good householder, as Shaolin hasn't. To call oneself Buddhas monk, yet not even serious in regard the precepts and dedicated to win and gain, actors for trade, is simply a thief. May no one get fooled by fools.
Wrong deeds stay wrong deeds, precepts are simple and no go, as well as kamma doesn't argue around.
But in regard whether a mass-murder could become a saint, Arahat, reaching Nibbana in present life: yes (as long as not killed mother, father or an Arahat). One may get familar with

Angulimala: A Murderer's Road to Sainthood, by Hellmuth Hecker (2007; 12pp./37KB)
A biography in the BPS's &quot;Lives of the Disciples&quot; series. A brief biography of Angulimala, the notorious bandit who was transformed by the Dhamma and eventually became an arahant.

Results of actions are still arising for Saints, but taken with ease, impersonal untouched by Arahts.
[Note that this isn't given for trade binding to the world, stacks, exchange... but for rekease from this wheel]