The biggest difference imo between bitcoin and USD is that participation in bitcoin is completely voluntary whereas participation in USD is mostly not, especially when you look at the things done to maintain global USD hegemony and the consequences of leaders who try to, for example, trade oil in currency other than USD or create a hard currency for their country when the de facto currency is USD. Were someone to print (which i can't believe ppl in this thread don't realize is a turn of phrase) a bunch of new BTC then it would only affect people who voluntarily chose to participate in that system, whereas if someone printed a whole bunch of USD and injected it directly into the stock market, those affected worst by this are not in the system by choice, and many times they participate only by coercion.