There are multiple providers that offer the services which Perot Systems offer. Once NAFTA became a reality, once China joined the WTO (Something the US could have probably not even withheld them any longer- this was even larger than the US), once India came onto the world stage... the results were long term predictable. Perot the president would have fought against NAFTA, Perot the CEO wants to grow his business and survive and can't change international treaties and trade agreements, tax code, Visa policies, etc. In that sense, you have to separate the two roles, that of the CEO who is dealt a hand of cards and has to play them, and that of the policy maker that in this case can pick the cards from the stack they want to hand out to the players.
Perot the CEO founded EDS and later Perot Systems (Now Dell), creating thousands of jobs, millions in tax revenues, etc. How about they just go bankrupt and you have nothing? Would that make you happier? Would you then feel he's a more patriotic guy that holds to his word? Perot was against NAFTA and he was right, but once it became reality, he can't ignore or pretend it away.