That is a good point, particularly your ending that it's for those who control the world currency... Until they fail.

But did that really improve the lives for people globally? Couldn't it be seen as a global redistribution of wealth, from countries who used the USD to the U.S? If you were cynical you might even say the U.S. robbed the other countries.

I wouldn't be so sure to conclude that inflation has allowed economic growth from your example, but more a redistribution of one.