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In all serious, how do atheists explain the fact that many things on Earth evolved to be beneficial/useful to man, even if this would not increase their survival rates, and therefore not be in any way evolutionarily selected for?

Yes, I understand that in some things this would increase the want of humans to cultivate it, increasing its survival rate and likelihood of having the human-beneficial trait passed on, but how do atheists explain things like plants that contain cancer cures in remote parts of Madagascar where man has never wandered? How do you explain something like aloe vera, which heals humans, and soothes digestive illnesses such as heartburn? Humans would note its usefulness and use it, but they did not cultivate it. This trait that was beneficial to human life emerged on its own. Is that all just coincidence, that there are so many plants like this that are beneficial to humans but would not have gained from having this trait?

I’m seriously asking here. I’m curious. How do atheists/other non-followers of intelligent design explain that stuff?