Actually, 2.5 million (which is obviously a PR figure) world-wide is not all that significant. When you factor in the fact that the G21 is a very small percentage of that number (the 9x19 models making up by far the largest portion of Glock's world-wide sales) and then consider the relatively small numbers of G21s in LAPD (remember, the G21 is not the issue sidearm--but one of several officer purchase options), the problems LAPD is experiencing with the G21 become more significant and cannot be swept away under the generalization that Glock sells lots of weapons. The G21 has been kind of a "problem child" for Glock since its introduction.
BTW, "in use in 65% of law enforcement agencies" is a long, long ways from "65-75% of the Law Enforcement sales market." Basically, if one officer in an agency ever purchased a Glock on department letterhead to avoid the FET then Glock counts that agency in their 65% figure (regardless of whether that weapon is even in actually used in a duty sitting or whether any Glocks are actually currently in use in that agency). Again, you have learn to read between the lines and take PR figures with a very large grain of salt.
BTW, "in use in 65% of law enforcement agencies" is a long, long ways from "65-75% of the Law Enforcement sales market." Basically, if one officer in an agency ever purchased a Glock on department letterhead to avoid the FET then Glock counts that agency in their 65% figure (regardless of whether that weapon is even in actually used in a duty sitting or whether any Glocks are actually currently in use in that agency). Again, you have learn to read between the lines and take PR figures with a very large grain of salt.