Stairway to avoid heaven (or hell)*

Now, just to beautify the walls with poster titled 'A step to health' to encourage people to use the stairs to burn off their belts of adipose tissue acquired through years of sedentary lifestyle and gobbling of rich foods because they can.
Why is it that people need to be told what to do, when and how? Is it not common sense to use the stairs rather than the lift when your destination is one or two storeys above? Like that people have to be told to smile to one another, to queue, to be quiet in a library, not to talk on the phone in a cinema etcetera .... Not to eat the styrofoam casing in the new TV box and to stuff your head in the plastic bag that wraps your new electrical appliances as it carried risk of suffocation! And the prescription drug carries a warning to keep away from children!