Can a traumatic experience push someone with potential psychopathic tendencies into full blown psychopathy?

Yes: With significant trauma, a stress response can evoke varying responses. If you feel you need to see a psychiatrist, i'd recommend seeking help earlier than later. it's better to get help before any significant damage occurs Best wishes Dr M

PTSD.: Post-traumatic stress disorder is a strong impetus for mental illness, both in those predisposed to such and in those who are not. In the context you mentioned, intense psychological counseling and perhaps medications may be helpful for someone so suffering.