When I was growing up my mother was always a friend to my siblings and me (in addition to being all the other things a mom is) and I was always grateful for that because I knew she was someone I could talk to and joke with and argue with and that nothing would ever harm that friendship.
Probability is expectation founded upon partial knowledge. A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty and leave nether room nor demand for a theory of probabilities.