"Did you ever find out the identity of the grey-haired lady?" asked Yang Qing.
"No, we have not. However, our power level is what has restricted us. If it is as my great great grandfather said that the person who did all that to the Shu clan is a palace realm cultivator, then with our strength and foundations we can't go around digging what happened back then.
We risk inviting disaster to the clan and not a way to prevent it. Unlike him, we don't have a massive sect to run to, and it's not like we can go to his master and try and seek his help on the matter.
After the death of my great great grandfather, he did come over to help for the first hundred years, but after that, he never came back. We can consider his ties with our clan severed.