The same rearranging-atoms idea shows up everywhere — sometimes it helps you, sometimes it costs you.
None of these reactions are "good" or "bad" by nature — it depends entirely on whether you wanted them to happen.
Cooking makes food safe and digestible. Respiration powers every cell in your body. Electroplating adds a protective, decorative metal layer to jewellery and cutlery. Medicines are manufactured through carefully controlled reactions.
Rusting weakens bridges and cars. Spoilage wastes food and can make you ill. Uncontrolled fires destroy property and life. Burning fuel releases gases that pollute the air we breathe.
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Same reaction, different context — that's the real takeaway.