"Nobody can guarantee that the ones who cause trouble will not be in that half," Fernandez said in an interview with the radio station America.
"The solution is to find the guilty ones, not deny the fans the chance to watch their team.
"Reducing it by one half is not going to reduce the problem by one half. There aren't thousands of them (troublemakers), there are 30 or 40. If we believe in magical solutions, we're wrong."
Fernandez also criticised the AFA for not consulting the government before making the decision.