Why is there no filter on the intake? It was proposed, but declined by management as &quot;too costly&quot;.<p>Why is it too costly? Because cutting visible costs is <i>perceived</i> as saving money and therefore Good, whereas prevention and maintenance are perceived as unnecessary, because Bad Stuff Just Happens Regardless.<p>Why? Because people suck at statistics (&quot;if we can&#x27;t eliminate a risk altogether, there&#x27;s no point in trying, let&#x27;s just forever keep fixing the fallout&quot;) <i>and</i> because Fixing Broken Stuff Is Someone Else&#x27;s Budget, Let&#x27;s Pass The Buck.<p>(Or at least, that&#x27;s the way things tend to turn out when you decide to go beyond the immediate cause-and-effect)