Dark matter bothers my sense of cosmic aesthetics. I'm not a physicist, I just like reading about how the universe works, so please don't attack my ignorance; there's only so much I can read. I'm painting with very broad strokes here.
Going back to the Forbes article, it provided some good arguments that this was supporting evidence. I had to concede that the blocks making up the argument seemed sound, so I started rearranging mental furniture.
Then there was the correction at the end of the article, and I'm at the position where I can understand how you can provide a situation that can at least provide supporting evidence to support dark matter.
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However, that's not the main point, it's just the foundation for where I'm going.
I used it to show my kids that you can understand/believe something that seems right or is "known" to be true. But when you come across evidence that shows you're wrong, or presents valid evidence to support a differing point of view, then you have to consider it outside of what you desire to be true. Mind, after examining it, poke at holes that exist and shred it if it's garbage, but if it's not susceptible to that, you need to change your world view.