You make a valid point, and I understand your perspective. Both predatory and parasitic behavior can involve manipulation and exploitation of others. The distinction between describing psychopaths as predatory rather than parasitic is more related to the imagery and connotations associated with these terms in the context of psychopathy.
Psychopaths are often described as predatory because the term "predator" evokes images of an individual who actively seeks out and hunts their targets. Predatory behavior suggests a deliberate and calculated pursuit of victims to achieve personal goals, such as dominance, control, or material gains. This description highlights the psychopath's proactive and aggressive nature in seeking out victims to fulfill their needs and desires.
On the other hand, the term "parasitic" is commonly associated with organisms that exploit and live off their hosts without providing any benefit in return. While the manipulation and exploitation aspects of parasitism are indeed relevant to psychopathy, the term may not fully capture the active pursuit and calculated nature of their behavior. Parasitic behavior might imply a more passive, opportunistic relationship, whereas psychopaths often display a more aggressive and intentional approach to achieving their aims.
It's important to note that the terminology used to describe psychopathic behavior may vary depending on the context and the perspective of the individual describing it. Different researchers and professionals may use various terms to describe similar aspects of psychopathy. The important factor is to recognize and understand the harmful and manipulative behavior exhibited by individuals with psychopathic traits, regardless of the specific terminology used.