I don't follow your argument here.
How about a hypothetical?
Let's say government bonds pay 3%, they have done so for decades, and we're confident they will keep doing so for decades.
So right off the bat, no lowering of interest rates ad-infinitum.
Let's also say inflation is 4%.
Everyone wants to beat inflation. But you need to find an investment opportunity for that. And the higher an investment yields, the riskier it is.
If you can't find a good investment, what's plan B? Surely it's not putting your money in a vault and losing 4% a year. Isn't plan B buying the government bonds and losing only 1% a year?