Re:Brain training = teaching
Well I think you'll find that it's a measure of the society we live in. Kids have always needed mental stimulation to get the best out of their learning. Over the years, the things that interest kids happens to change, and if this persuades kids to pick up and learn then surely it's a good thing?
Personally I think the larger problem lies with society itself. More and more children are completely uneducated upon starting school, with a growing group of the population seemingly uninterested in their children. Then in other groups, people shy away from any form of discipline and then wonder why children don't learn the difference between right and wrong, or at least the consequences of doing the latter.
Most "bad" kids have their chances ruined before they ever reach school. Ask a primary school teacher - the difference between a child that was encouraged to learn by their parents (pre-school) and one that was not can be huge.
Unfortunately there also is a tactic of perhaps the "least intelligent" among us to have more kids as a means to gain more benefits. Which makes this the fastest growing section of the population.
I just don't think people should look to teachers as the root cause of education issues in every case. But then that'd mean people had to look to themselves for responsibility, and we all know how bad people in general are about accepting blame.