I know that Mercola doesn't do much for you guys, but here is his take on squalene and may answer the question of why it can be both beneficial and dangerous.
Quote:
What Squalene Does to Humans

Your immune system recognizes squalene as an oil molecule native to your body. It is found throughout your nervous system and brain. In fact, you can consume squalene in olive oil and not only will your immune system recognize it, you will also reap the benefits of its antioxidant properties.

The difference between “good” and “bad” squalene is the route by which it enters your body. Injection is an abnormal route of entry which incites your immune system to attack all the squalene in your body, not just the vaccine adjuvant.

Your immune system will attempt to destroy the molecule wherever it finds it, including in places where it occurs naturally, and where it is vital to the health of your nervous system. [viii] . . .
FWIW.
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Better is the Enemy of Good Enough.
Okay, what’s your point??