If George H.W. Bush is a war criminal, then so is Barack Obama, who own drone wars, torture, backing Islamists in the Arab spring, Libyan intervention, backing neo-nazis in Ukraine, etc. has made access of this world, and a lot of blood shed.
George H.W. Bush for all his faults was actually restraint in foreign policy, didn't intervene when the collapse of the Soviet Union was happening, didn't intervene when the revolutions of 89-92 swept Central & Eastern Europe, he did get the Iraqis out of Kuwait, yet stopped short of going into Baghdad, and overthrowing Saddam, and in the case of Panama it was quick, and was to stop a pro-soviet drug dealer threatening our country, and flooding our streets with drugs. Not to say I agreed with Desert storm, as that was a Arab vs Arab problem.
As far as war criminals go look at Barack Obama (ie - backing genocidal Islamists against Christians, alwaites, druez, etc. In the Arab spring mess, the Libyan intervention using deplated uranium, giving weapons to the drug cartels in operation fast & furious, expanding bush jr drone wars, backing the Saudi Damon induced invasion and war on the Yemeni people, etc. continuing torture, etc) , Bill Clinton (ie - deplated uranium over former Yugoslavia, using a drug dealing death squad to kill Pablo Escobar, sanctions killing up to 500,000 Iraqis, no fly zone strikes targeting civilians in Iraq, torture, etc.) , Harry Truman (ie - nuclear bombing of Japan, etc.), George W Bush (ie - Drone wars targeting civilians, Guantanamo bay, secret prisons, torture, etc. )
out of all the people he choose to call war criminal former President George HW Bush was down the list. Heck Gerald Ford, and Jimmy Carter were even worse by supporting the Muslim Milltartist Indonesian occupation, and Genocide of Catholic East Timor, and the Muslim Turkish massacre of Orthodox Greek Cyprus.