What is Ted Bundy's motive for killing?

Psychopaths need no motive. It's a psychological disorder that compels them to kill, while there may be triggers (didn't like how someone smelled, someone picked a fight with them, etc). The motive itself can be excused with some manner of social commentary or poor upbringing, the truth remains that the brain chemistry is not adequate for the psychopath to function in society and ultimately leads them to kill.