I'm forever blowing bubbles the normal rise and fall in capital values of risky assets

Yes, exactly right. Not every increase in asset prices is a bubble, not every fall (even if that fall happens to be inconvenient for leveraged longs) is a bubble-bursting. The definition of a bubble is that it's a self-sustaining, self-reinforcing feedback loop - if prices are going up because some outside influence is propping them up, that isn't a bubble.