I don't see how that works. If the US Government has to sell bonds to borrow money to finance the deficit, and buyers start disappearing, they have to raise interest rates to make the bonds more attractive to the remaining buyers, don't they?
Buying treasuries = the Fed giving money to the US government
Quantitative easing = the Fed giving money to banks
In the case of the US, the entire game is also complicated by the fact that the US dollar has insinuated itself into the global economy. Most critically in oil markets.
Because of this, there are some things the Fed can do (mostly) without the consequences other countries would face.
Look at the wealth inequality increase since 2008. It can mostly be attributed to federal reserve QE policy.