So even if a woman can defend herself and is strong, a husband and father is still protective?

Anonymous
This is regarding my friend's parents:
Both are good martial artists. Yet he still acted protective (ex: hugging her when walking together late at night and making her feel safe) when she was his girlfriend and even now as his wife, he acts the same.

They taught their daughter (my friend) their skills too. She can also handle herself but her father is still protective over her too. Even though the guy is 6'4; both her and her mother are 5'10. That's still tall for a woman. So biology doesn't change much even if the woman can hold her own physically and is strong/tall herself?
So even if a woman can defend herself and is strong, a husband and father is still protective?
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