They damage the body causing, in the best of cases, aging, and at worst, severe diseases. Them radical free are them electrons (the load negative of them atoms) of them molecules of the cells of the body human that is found in State unstable i.e. without link some. These tend to steal an electron to other molecules to achieve a stable state, but generate radical free in other molecules. Of this form is performed a cascade of radical free, bursting with the cell alive. Free radicals form, also environmental factors like pollution, tobacco and poor diet favors not only your own body. If lay down a parallelism between it physiological and the same concept applied to the environment social, would deduct that equal risk and danger supposed the individual that acts of form individual operating unilaterally low its own doctrine and soaking of your anarchy to all which manages to capture low its ideology, destroying all what is you crosses by its road and spreading the instability of the system.
"It constructive is dumps and acquires a heading destructive when not has of a stability that you allow escape from the insecurity and the uncertainty"