MAKO: Captain Sorlie, sir: if I hadn't been installed in Libretti's head, she would have been brain-hacked with the rest of the J.S.C. and she'd be a "meat-puppet" today.
Kowalski sent Libretti's husband and son out of town to protect them. If that hadn't happened they'd probably be dead at puppet-Libretti's hands right now.
Oh, and you'd probably all be dead, too, since I'm the one who alerted you to the whole plot.
SORLIE: The end doesn't justify the means.
MAKO: It necessitates the means, but it can't ever redeem people like me from the means we've employed. Not even if we save the world.
SORLIE: You've had this argument before.
MAKO: In another body.
I'm a real monster, Sorlie.