Hi Jean. Please forgive me for making this point and i do realize that English is not your first language, but i am not sure that the word "mitigate" was quite the word you were looking for here.
make less severe, serious, or painful.
"he wanted to mitigate misery in the world"
synonyms: alleviate, reduce, diminish, lessen, weaken, lighten, attenuate, take the edge off, allay, ease, assuage, palliate, relieve, tone down
"the worst symptoms have been mitigated"
lessen the gravity of (an offense or mistake).
"he would have faced a prison sentence but for mitigating circumstances"
synonyms: extenuating, justificatory, justifying, vindicating, qualifying; face-saving; formalexculpatory
"if not for mitigating circumstances, he would have been convicted"
We are, of course, always welcoming of people from all cultures to join us in our conversations on keris. As Alan has pointed out however, being of the Indonesian culture does not necessarily give more weight to that person's opinions, beliefs or knowledge of keris culture just as a Frenchman is not necessarily more knowledgable of fine wines. Weak analogy perhaps, but hopefully it gets the point across.