Earlier quoted context omitted.
Or 3: The law works differently than you expect. Asking for a victim to find the "root cause" of a problem is too much to ask. If X wronged Y causes a wrong to happen to Z... the legal system is largely designed for "Z sues Y" then "Y sues X". Asking for Z to sue X directly is asking for too much. There's no way for Z to even know that X exists.
> There's no way for Z to even know that X exists Other than the time that X explicitly and directly asked Z for access to their data, you mean. This isn't similar to a case where I stored my users' info in a database on Cloud Hosting Service Inc machines, CHS's lax security allowed the data to be hacked, and I am now accountable to my users because I used an insecure service. Facebook's role in this situation was, l…
Asking for Z to sue X has a number of issues:
1. Z doesn't know Y's policy towards X. Is the problem truly Y's fault or X's fault? "Z sues Y" doesn't necessarily implicate Y as the root cause, it just proves that Y was "along the way" towards the root cause.
2. Y sues X is a totally separate question. Consider the case where a car-parts company creates a suspension ("X"), who sells their suspensions to Ford (aka: Y). Sometime while customer "Z" was driving, the suspension fails. Z sues Y for a million bucks to cover the cost of back surgery or something. Y then has to argue with X to figure out who was responsible for the suspension failure. Depending on the agreements / contracts Y could be the root cause, or X. (Maybe it's Y's fault: if Y was using the suspensions incorrectly and X can prove it, then the Y-sues-X case will fail).
In this #2 case: if Z sues X directly, Z will fail (because X is not at fault). Its safer for Z to sue Y... and its also the morally sound way to move things forward.
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For better or worse, Z (the typical user) has a relationship with Facebook (Y). Cambridge Analytica is X. Whether X or Y is at fault is still ambiguous from Z's perspective (no reason for Z to come up with legal arguments and determine the "right person to sue").
All Z has to prove is someone wronged him, and that Y is the next person up the chain. Let Y's lawyers figure out if Y or X is responsible. Z just needs compensation for Z's issues alone.