So I understand biology, I’ve researched biology for most of my adult life, and one of the fundamental tenets of biology is the Theory of Evolution.  I don’t think it’s an overstatement to say that evolution is as central to modern biology as Quantum Theory is to modern physics, almost everything we do and study ties back to it in some way.  But like all scientific theories, evolution is widely misunderstood on the internet, and not just by dogmatic creationists but even by the science journalists and appreciators who we would expect to understand it.  It often comes back to a simple statement:

Not everything evolved to be the way is it today

Evolution is a process where certain traits are selected for or against, but not all traits undergo this selection pressure at all times.  Some traits are relatively “silent” in that mutations affecting them don’t give significant advantages or disadvantages so there is no selection pressure.  And some traits are downstream of the selection pressure, in that while they are affected by a trait which is being selected for or against, they themselves are not under selection pressure and so don’t get acted upon.  And some traits are just the best of a bad bunch, evolution does not make things perfect, it makes things good enough to thrive within their niche.

Let me give a few examples.  I occasionally see or hear a discussion about “why would humans evolve to get cancer?”  The misunderstanding here is thinking that cancer is just a phenotype that can be selected for or against, like height or hair color.  Most cancer is somatic in nature, meaning it does not come directly from the inherited genes but from mutations upon those genes.  These mutations were not inherited nor will they be passed down (unless they occur in the sex cells) so it isn’t true that evolution is even acting upon these mutations.  OK but why did the human body evolve to allow these mutation to happen?  That’s just the best of a bad bunch, the human DNA repair and replication machinery aren’t perfect and there are big tradeoffs that would have to be made for our DNA to not allow mutations whatsoever (if that were even possible).  The human DNA machinery does a very good job at what it evolved to do, replicating and repairing DNA with high fidelity, and just because it fails sometimes doesn’t mean that it evolved to fail, but instead means that there was no mutation that created machinery which never failed.

Likewise there isn’t always an evolutionary reason behind every other weird aspect of our bodies.  Why do wisdom teeth cause us pain?  Or our spines?  These things evolved during times when we lived differently to today, so trying to understand them in the evolutionary context of 2022 just doesn’t help.  Clickbait article writers like to point to these as “why evolution is not always helpful.” But they’re simply examples of the author misunderstanding evolution more than anything else.  So if you ever find yourself thinking “why did we evolve to be weird like this,” first ask yourself if the question even makes sense.