your brains been trained since ice age to run before it's too late, so it's simply your emotions and you let them control you.
remember, they wan't you guys to sell it, that's how we gain money

Well our understanding has evolved as well since ice age so we pretty much have more control now than before. Though of course given certain situations it will be quite hard to keep cool. But we can decide now if we want to be affected, and we have options to do something else