"It is no doubt true that in the administration of justice — whatever the context — the appearance of impartiality as well as its reality should always be our goal. Public confidence in the administration of justice necessarily depends on public understanding. All of this should virtually go without saying. Actions that create a perception of unfairness are to be avoided. But those who administer justice cannot be required to be the guarantor of the public perception of their work. Sometimes that perception is shaped largely by extraneous forces and circumstances that are beyond the control of those who administer justice. And I would suggest that it is a dangerous policy indeed to prohibit actions which the fair administration of justice in fact requires simply because some segment — however large — of the public judges those actions to be other than just. Adopting such a policy promises to reward those who seek to undermine the faithful administration of justice by false charges of unfairness."