Instructors are taught to enter and recover from spins, and examined on this in the initial FI test. The problem is that relatively few new FIs have spun before the FI course, and there simply isn't enough time on the course to go into depth with them on spinning while also teaching the rest of the course. It's a sad reflection on the JAR PPL and CPL that such a crucial part of flight is left mainly to those who do aeros as a hobby...