Your argument, then, is that Pandora should apply password hashing to keep people from being compromised elsewhere? Assuming they only had two online accounts this might make sense. Assuming every single one of their accounts, all the same credentials, had perfectly implemented password hashing, this might make sense.

But that is bullshit and we both know it.

There will always be a bad implementation, or a mistake, or an insider, or a man in the middle. If all their 100 accounts are the same creds, it only takes one time and they're fucked.

It is completely impossible to have perfect security on all these accounts. It is inevitable that one will get cracked. At that point, blaming anyone but the user is lunacy.