The sexual harassment charge in the Thomas confirmation hearings has had the effect of a wind blowing through the country. Nothing and no one involved will be the same again, which is all to the good. Not only was the issue of sexual harassment brought to light, but so too has the need for greater justice and equality - women versus men, employee versus employer. Entrenched interests always resist change, but cannot stand forever.T. White, Arlington, Va. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.