A day after the terrorist attacks on the World Trade Center and the Pentagon, General Motors Corp.'s vice president of corporate relations and diversity posted a message on an internal company Web site. "We sometimes forget that the GM family consists of 388,000 very diverse employees representing many different countries, religions, ethnicities, as well as points of view," Rod Gillum wrote. "Let us pull together as one GM to value both our differences and our similarities." Similar messages of unity and tolerance have flooded e-mail inboxes of the nation's workers, highlighting corporate America's increased sensitivity to diversity since the terrorist attacks and subsequent retaliation...They fear that the incidents of backlash and racial profiling against Arab-Americans and others since the Sept. 11 tragedy could be repeated in the workplace, leading to potential liability and disruption of business.