Why is he so against medicine?

He explained his views in detail in his confirmation hearing. He believes that pharmaceuticals in general are dangerous and overused, "the third-largest cause of death in our country after heart attacks and cancers" in his words, and wants healthcare to focus more on healthy food than on medicine.

That's how he got where he is today.

Same reason he's anti-fish.

Because that stance has been very beneficial for him financially and politically, ever since his pivot from legitimate and respected environmental lawyer to anti-vaxxer. He transitioned after receiving incredibly positive feedback for amplifying conspiratorial narratives while riding the coattails of the infamous "thimerosal causes autism" panic of the 2000s. https://en.wikipedia.org/wiki/Deadly_Immunity

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