> they seems to forget that the majority live very well in harmony with
those
> microorganisms .
> how come ?

There's good "bugs" and bad "bugs".  Generally, the good "bugs" outcompete
the "bad" bugs over time, especially outside the body or outside a food
item.

> Spreading fears might be very profitable economically ( as the whole
health
> industry shows)  but from my own experience,  is not  promoting health ,
> quite the contrary.

Preventing communicable disease is based on science and risk assessment.
You're attitude is reflective of the dark ages.

> I my opinion the probability of exposure to bacteria becoming a life
> threatening issue is very very small.

Depends what dose of parasite, bacteria, or virus one is exposed to, and
one's immune status.

Rob