Thank you for the question.
Currently, the vast majority of people who own a handgun give as a reason the fact that they are a member of a shooting club.
A group such as the IPSC receives funds from the arms industry, uses handguns and assault-style firearms, and organizes games which are the polar opposite of legitimate sport shooting, i.e., Olympic shooting. The IPSC's members organize games based on hostage taking, violent home invasions, etc.
If the IPSC and its members were exempt, IPSC competitions could in theory be held in all shooting clubs. All members of the IPSC who currently own handguns could be exempt. That is essentially what one of the directors of the IPSC admitted in a letter sent to its members.
Such an exemption would nullify the objective of the ban. The objective is to limit the number of handguns in circulation. Exempting sport shooting with handguns would be tantamount to keeping the status quo.