There are a number of "controversial" speakers, with whom I probably disagree on virtually every conceivable subject, but would agree should be they allowed to speak. Why, say, Sarah Palin, who has never finished anything she started (except, perhaps, giving birth) would ever be invited to speak at a college is beyond me but, sure, let her speak.
Condoleeza Rice, however, along with George W. Bush, Dick Cheney, Donald Rumsfeld and anyone else who knowingly lied our nation into a war to protect American Oil interests, costing Americans and Iraqis 1,000's of lives, locked National Guard members into perpetual service (a "backdoor draft" intended to avoid piquing the curiosity of the majority of Americans to wonder why the loved ones of the wealthy weren't required to serve alongside those of the rest of us) a long with their equipment, so that there were insufficient personnel and resources available to use in fighting hurricanes, tornadoes, fires and other disasters here in the United States, as well as draining the surplus created under the Clinton administration and coming perilously close to driving the nation over an economic cliff.
If I were a pending graduate, or graduate's family member, who had a loved one die in Iraq, a family member injured, missing, return home with mental and/or physical problems - if I were one of those people whose families were shattered, losing my home, losing my children, my family on food stamps then hearing my family disparaged by the very people who put my family in that situation - the last person I would want to hear from at my (or my family member's) commencement, would be a member of the Bush administration.
Lynne and Liz Cheney, Barbara Bush, former President George H.W. Bush, Laura Bush, legislators and pundits who voted to support the Iraq War and still support the lies that led us into it, sure, let them speak. But, please, if we can't at least have an investigation or a hearing on a group of people who could legitimately, argueably called "war criminals" and accused of "treason", let us not legitimize their monstrous behavior by asking them on talk shows to offer their "opinions" on anything (much less Iraq, Afghanistan and President Obama's or Secretart Clinton's "culpablility" with regards to Benghazi, or their response to the rest of the world on *any* issue) or giving "advice" or inviting them to offer "adivce" of any kind to graduating class of people their behavior has most likely harmed.