All people residing in the country of Gradara approve of legislation requiring that certain hazardous wastes be disposed of by being burned in modern high-temperature incinerators. However, waste disposal companies planning to build such incinerators encounter fierce resistance to their applications for building permits from the residents of every Gradaran community that those companies propose as an incinerator site. Which one of the following, if true, most helps to explain the residents' simultaneously holding both of the positions ascribed to them? ['The substantial cost of high-temperature incineration can be partially offset by revenue from sales of electric energy generated as a by-product of incineration.', 'High-temperature incineration is more expensive than any of the available alternatives would be, and the higher costs would be recovered through higher product prices.', 'High-temperature incineration minimizes the overall risk to the human population of the country from the wastes being disposed of, but it concentrates the remaining risk in a small number of incineration sites.', 'The toxic fumes generated within a high-temperature incinerator can be further treated so that all toxic residues from a properly operating incinerator are solids.']