Whether this is good or bad for the US economy is debatable (and unclear), but it's not really a recipe for currency manipulation at all. I have no idea what you're talking about.
And would have risen more without QE.
And risen even more than that if they had started destroying currency. But the usual target for a currency is value stability with other major currencies, and "devaluation" means that its value goes down compared to most other currencies.
It's completely normal (and basically required to prevent deflation) to create some new currency during normal (i.e. growth) times to provide more currency to use for the increasing number of transactions.
I truly can’t wrap my head around this argument: been on the back of my head since I heard I think Peter Thiel say it (iirc.)