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This seems like fairly standard procedure to be honest, I'm not entirely sure what the issue is here...?

Especially given quotes such as "To the extent that Twitter has previously suspended the accounts of users publishing the Stolen Information, SPE and its employees are sincerely grateful to you"

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There was no need to be threatening in manner that they were, and, as far as I understand, the threats are non-actionable (that is, Twitter can't be held liable in the manner they are suggesting).

Letters like this go back and forth between companies all the time. It doesn't even sound threatening to me. Just a standard legal complaint. I'm sure there were a handful of phone calls made first. Sony and Twitter couldn't figure it out over the phone, so Sony sends the official letter saying, "here's why we're upset, this is what we want you to do about it, if you don't we will climb the legal ladder some more until it's all straightened out."

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