The real reason why the US Central Bank cannot raise interest rates can traced back to eight simple words – their response to the 2008 global financial crisis.
US Central Bankers reached a crossroad of responsibility versus socialism for the über wealthy years before the 2008 financial crisis manifested, and they chose socialism for the über wealthy as could be expected, because Central Bankers have to somewhat appease the highest echelons of global wealth if they don’t want this class to turn their resources against them and argue for the dissolution of Central Banks. When Central Bankers, both in the US and in Europe, deliberately and very consciously chose the path of catering to the few thousands that constitute the class of the über wealthy over helping the remaining 6.8 billion people on planet Earth in 2008, they sealed the fate of what their decisions had to be some ten years later.
During 2008, all of the largest European banks and US banks were completely bankrupt. To this day, I know that claim is disputed even though Finance Ministers that had privy to this data, like Greece’s Yanis Varoufakis, have made such claims.