The problem is the Hague Convention of 1899, Declaration III, which prohibits the use in international warfare of bullets which easily expand or flatten when making contact with the target. There are many excellent 9mm hollow point loads that perform as well as a .45 in most situations.
I have read that the reason hollow and soft point bullets were banned was because the GERMANS could not get them to work through their new Lugers so they demanded only FMJ be allowed.