1/2 We must add that the operations involve enormous amounts of private and public capital. They must not stop merely because the public is uneasy. The use of a technical means must not be abandoned because it has harmful effects. The situation is the same as in the 19th century when the exploiting of mines went on even though miners suffered from pulmonary ailments. Investments have to pay dividends (to the state or the firm). The harmful effects are less important than