The end of the Purdue Pharma bankruptcy case has left a bitter taste for those who wanted to see more accountability for members of the Sackler family.The Sacklers will give up ownership of the company, go out of the international opioid business and pay $4.5 billion in cash and charitable assets under the settlement. But they also will escape any future liability over the nation’s addiction and overdose crisis as part of the deal that was given preliminary approval by a federal bankruptcy judge.Some state attorneys …