I agree with you on this point that a guy who trains only defense will get crushed. A good defense compliments a good offense and vice versa.
My point when it comes to defense is this:
If you have young trainees, build their defense up first because if you don't it will only take longer when they get older. Training the offense has shown to be quicker, based only on my personal observations, as compared to trying to train defense.
Let the defense be the solid foundation you build your offense upon. Don't get frustrated, Bigcat. I know you're passionate about offense from my time in III.4 with you.
As far as my stance on defense, when a team has a good defense, it can exponentially increase the effectiveness of the offense. An offense that can slow their pace down and concentrate on running their offense efficiently because their defense makes the easy stops they are supposed to make, increases the odds of picking up a win. However, a defense that fails to make the easy stops increases the amount of work they need to do on the offensive end.