Chemicals are literally everything you have ever touched, tasted or smelled. Every vitamin you swallow, beverage you drink or food you eat is made of nothing but chemicals. There are chemicals that are hazardous to your health, of course, but you, I, and essentially everything else are made of nothing *but* chemicals. Chemicals make the world go 'round, and acting like they are unnatural or bad is contrary to the nature of existence.
This image I linked to also hits on another pet peeve of mine: the idea that bacteria are all bad. There are millions of bacteria on most surfaces. Most are harmless, some are necessary for important aspects of human life, and a select few can sometimes make us sick. Things like antibiotics wipe out an entire ecosystem of bacteria in your body; antibacterial soaps and cleaners wipe out all but the strongest bacteria, meaning that only the ones left alive can survive and the species evolves to become resistant to the antibacterial substance. Drug resistant bacteria and diseases are appearing all over the world because of careless use of antibiotic and antibacterial agents.
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