jumping off bridges is not needed in peoples lives... if you want an adreniline rush go jab yourself with an epi pen 
Nor is fast/modified cars, football, treks to the poles, smoking, alcohol, rugby, cricket, parachuting, drugs ect ect. All these things are not needed and all have killed people.
What is needed in life is very little, clean water, warmth, a partner and enough food so as not to starve, that is all the animals need and it's all we need.
We as humans don't need more than that, but we want more, it's in our nature to to push the boundaries, to invent new things and fill our lives with meaningless materialistic cr*p, we all do things that to others is stupid or unnecessary, but I'd rather die at 30 having done the things I really wanted and enjoying myself, than live to 80 being careful and thinking I didn't get to do anything I wanted and then dying in my sleep.
