We agree China is more toxic & japans central banking interventions are indeed transparent. Hell the economists in charge of the policy even seem proud of the strategy & convicted in its outcome even though they've been wrong since you were probably in junior high.

Even today they still claim the policy is driving inflation toward some goal seeked objective. It isn't but that doesn't hold them back from saying it & keeping a forever bid in the market place.

As for "safest" investments well.. ya. You get 0% & sometimes less than that & sometimes a few basis points more so if the yield to maturity is an indication of risk then sure its riskless. The trade is your capital is lent to a sovereign for ~0% for 10 years with guaranteed inflation decay (cost of carry) & it's possible a default could occur. The only way a default won't occur is by creating more bonds & currency to finance the old debt when a tiny yield is present. Pass, at least with my money. If I need a place to park other peoples money where I earn a maintenance fee (pensions, endowments, etc) doing so regardless of performance then OK I'll do that. That's a fine incentive structure as a fiduciary but structurally it's a guaranteed no upside & 100% downside no matter how unlikely the downside. I like my money too much for that.

I don't like the heavy handed interventions in any country but Japan is without a doubt the most reckless & crazy of them all. They've been doing it the longest & in the last 10 years went from bat shit crazy to mach 3 with hair on fire. It may feel quite common to you but I assure you central banks creating money to buy gov't debt to finance interest on previously issued debt hasn't always been so common. It's not a sign of strength.