This is being framed is as miscarriage of justice, and from a moral perspective it definitely is. The problem is that the legal grounds on which Purdue (and the Sacklers) can be sued are actually kind of weak.<p>Broadly, the things Purdue is accused of are
1) Aggressively marketing opioids to doctors, and
2) Lobbying the states to change various laws around prescription and marketing of opioids<p>The problem is that for direct liability, there are two more actors that need to be considered - the doctors, and the patients themselves. Doctors are considered to be experts, and patients are often breaking the law when they misuse opioids. Both of these facts break the chain of liability, and so arguing that Purdue is legally liable for the ultimate addiction of the patient is difficult.<p>As a result, people have tried to sue Purdue under more general "public nuisance" statutes, rather than regular tort liability. A public nuisance is when someone interferes with a right that the general public shares in common. However, this area of law is not very well developed - a lot of it is carryover from old British law, and winning those cases isn't a slam dunk. So there are certain objectors to the settlement, but I don't know why people think that it would be easy to hold the Sacklers criminally responsible or to get more money than this settlement.