Then we ahve diferent definitions of PC.
I'm not so sure that we have different definitions--probably just different judgments about when it applies.
I am, in fact, a victim of the New Math. And please expand on what you consider "learning by explination".
I was in the generation just before you, and you have my sympathies. The New Math was an attempt to teach by explaining the "underlying principles" of mathematics--set theory. The worst implementations tried to introduce axiomatic principles of math early on. What happened was that teachers didn't really know what they were teaching, and students weren't taught the skills that they needed in order to perform well on math calculations. In general, they were trying to teach abstract principles well before the age when children were capable of using those principles to gain more insight into math. It was a fad that caused more damage than good.
Different school systems result in different experiences. And I've been speaking of basic curriculum, not extra-curricular activities.
You are right that different schools gave different experiences. I still feel that you have overgeneralized education system back in those days. I would describe the atmosphere in my high school as stimulating. It was during the Kennedy years (Kennedy was assassinated while I sat in a high school Latin class--I'll never forget hearing the announcement over the PA system), and controversy was no stranger to the classroom. We discussed and debated everything, even in the classroom. This was not true of all classes, of course, but we were encouraged to think about controversial issues.