2% is a lot! There's only fifty things you can invest 2% of GDP in before you occupy the entire economy. But the list of services people need, from food, water, shelter, heating, transportation, education, healthcare, communications, entertainment, mining, materials, construction, research, maintenance, legal services... there's a lot of things on that list. To allocate each one 1% or 2% of the economy may seem small, but pretty quickly you hit 100%.

I will put it differently,

Investing 1 or 2% of global GDP to increase wealth gap 50% more and make top 1% unbelievable rich while everyone else looking for jobs or getting 50 year mortgage, seem very bad idea to me.

It’s implied you mean that the ROI will be positive. Spending 1-2% of global GDP with negative ROI could be disastrous.

I think this is where most of the disagreement is. We don’t all agree on the expected ROI of that investment, especially when taking into account the opportunity cost.