That just sounds like an egotist to me. You make it sound like it's inevitable.
Humans are free to think, act, etc. But they usually bend and conform towards certain forces and tendencies moreso than act in truly arbitrary and capricious manner. Lead poisoning can compromise one's "free will". He can still function to an extent, he's not dead, but moments of aggression or violence from someone poisoned by lead that is not completely "free".
Or someone with psychopathy wiring of the brain. He too has the capacity to think, but the whole wiring causes him to behave in a manner not quite in line with "normally wired" humans.
Basically, the whole discussion is trying to reconcile two simple concepts:
1. "This wiil/'is going to' happen"
2. "Person X may or may not choose to do something".
The concepts are the same, but figuring out how to reconcile the two results in piles of text.
Humans, being social animals, are particularly receptive to communication and following the actions of "cultural influencers". So while one single individual cannot automatically be said to carry a tendency, when they belong to certain groups, behavioral tendencies in those groups do manifest. In the realm of politics, people usually never break tendencies if they believe one side is unambiguously better. In terms of general cultural habits, certain things just seem to always manifest, such as an Asian's "tightwad" approach to spending.
Hormones? Food and sex drive actions up to the biggest of stages, and it's usually hard to say no to either.
In subjects where there are no stakes, humans become flexible.
I don't believe a single human has nothing "sacred". Something they're hold dear. Could something trivial. Could be some big cause.