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If they had put their hatred on the pandava family, it doesn't have any problem at all in this situation but if they put their trust on the town head their entire family will be wiped out from the face of the world. 

That is the reason why these elders told all the history to let them know who is to be trusted and who is not to be trusted.

"But grandpa is there any proof that the pandava family is not the one who killed our family head and they do might have grudge towards us as they find that the ones who are responsible for the death of their family members is our family heads, so how can we trust the pandava family" asked Bhanu.