Because the only way we can know dark matter exists is its effect on other people. I feel this in analogous to God in that we can't see him, but you'll definitely know if He's working in a specific person's life.
A revision on the previous post: we know it exists because of its effect gravitationaly on other planets and how it bends light. I have to disagree with you, respectfully of course. I believe that it's these analogies between ourselves, nature, and the spirits beyond (if you will) that hold the most truth in our universe.
Don't fret about the nitty gritty definition of dark matter and its effects; I understand what you're meaning to say now. Would you rank these analogies you speak of above logical arguments? I don't want to get ahead of ourselves by putting words in your mouth, but I am curious why (if I'm not mistaken) you think a figurative connection between our observations of dark matter and your definition of a god is a greater truth than the reasoning that would show matter does not necessitate the existence of your idea of a god.
I don't see the arguments as two separate things, but rather I see the analogies of nature to be logical arguments themselves. I believe that these analogies have become deemed 'illogical' or 'irrational' and that is what has led to a lack of dreaming. I feel that understanding the importance of our connection with nature is incredibly undermined and that for us as humans to excel in all aspects of life, we must not discredit these analogies.
The only difference between dark matter and the matter that you can see is that it does not interact through the Strong Force or Electromagnetism. We can't see it because there was never any reason to; our eyes are designed to see what we call the visible spectrum. We can't see most radiation either but we can still observe it. This does not necessitate any divine influence.
This is not a trait unique to dark matter, plenty of experiments rely on only being able to measure the shadows on the wall. Hell, that describes like half of science!
Then shouldn't all of that be sort of signal that there are things we aren't meant to understand?
Almost my logic. I am to interpret that your words have meaning to them. Say I saw a bunch of Chinese characters. I'd have no idea what they'd mean, but I'd know there somewhere there'd be meaning to them.