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The amount of money he's paid is irrelevant.
Also, your argument is a case of the ends justifying the means - that their actions were acceptable because he turned out to be the leak.
Now, as far as researching goes, how about reading this
published 11 days ago.
Here's an excerpt:
""These techniques were practiced on a number of individuals including certain directors, two employees and a number of individuals outside the company, including journalists," Dunn said in a message on Tuesday, a transcript of which was provided by the company. An HP representative confirmed that two current employees had their personal records targeted, but would not identify the employees or say which records were accessed."