Robert Hare describes a specific pattern he calls the "nurturance-seeking missile": some manipulators are unusually skilled at identifying warm, caring people and then aggressively attaching themselves specifically to exploit that person's nurturing instincts for money, time, or favors. It isn't random who gets targeted — kindness itself functions as a visible, exploitable signal, the same way a predator might key in on a specific trait rather than choosing targets at random.
The uncomfortable implication is that the very trait that makes someone a good partner, friend, or colleague — genuine care for others — is also what makes them identifiable as a good target. This isn't a reason to become less caring; it's a reason to pair caring with a separate, deliberate check on whether that care is being reciprocated or simply consumed.