I suspect Harold's vast fortunes are currently off-limits. No doubt Samaritan has flagged his numerous bank accounts for activity. Control's survival is somewhat curious, but she's not actually an active enemy either of Samaritan or the country. Harold wasn't exactly in a position to forge clean identities, being held captive as he was.
Maybe the servers will eventually allow our team of hackers an means by which to infiltrate Samaritan's systems with a virus similar to the one Finch wrote to attack the Machine last season. If Finch can crash the Machine, I certainly believe he and four other brilliant computer programmers can find a way to take down Samaritan.
Greer may think what he's doing is the right thing, but there is a fatal flaw with placing the future of humanity into the metaphorical hands of a logic-based system. A logic-based system relies on particular underlying assumptions to form the basis of its reasoning. If the answers to those most basic questions are in any way flawed or incomplete, the center cannot hold and the system breaks down. Furthermore, I find your "good and evil is a matter of perspective" statement rather disturbing at its core. Moral relativism is an extremely dangerous abyss. Where is the line? The most heinous acts can be argued as being necessary for the "greater good."
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