Precisely. People can and will disagree with others. They just will. So many who are young, are certain they have attained great wisdom and must somehow, by hook or by crook, sway others to their view of what is wise and correct, never stopping to consider that they might just be a naive pup that is simply overfull with the preening pride of presumed intellect. As Mark Twain wrote (I paraphrase from memory) "When I was 14 I couldn't believe how ignorant my old man was. And when I was 21, I couldn't believe how much he'd learned in just seven short years." Maybe just chill and accept that not everyone shares the same perception of reality, or of the causes of the effects thereof.
That said, there are plenty of times when a thing simply must be sorted out to move forward.
Consider carefully whether you want to attempt to change the views of someone on matters that may not matter. My cousin just retired from a major firm in the aircraft industry. He designed components for sophisticated aircraft that most of you would instantly recognize. That he was deeply religious and did not accept the theory of evolution, seemed to have zero effect on his status or effectiveness as a senior engineer with that firm.
My father was fond of saying, "A man convinced against his will, Is a man of the same opinion still." --source unknown