I believe normal people like me are still wary of danger, and even have physical responses (tensing up, moving gingerly, holding your breath) when under the ill

I believe normal people like me are still wary of danger, and even have physical responses (tensing up, moving gingerly, holding your breath) when under the illusion of danger even when logically knowing there's very little danger, such as when standing on a transparent balcony floor or walkway of a very very tall building, or preparing for a drop from a tall roller coaster. I think that's all the physiological response one needs without getting psychologically crippled, paralyzed, making rash decisions, or just generally having a bad time when presented with these situations.