Earlier quoted context omitted.
how would that $1 be destroyed?
A better or more accurate example I realize would be pointing out that if the US government prints money then the overall value per unit of the of the currency goes down. Bitcoin is mined which is akin to printing money. I'm not sure I am using the correct terminology, though trying to better articulate. Currency gets destroyed buy governments. They say take $1 million of cash and burn it/remove it from circulation.
so the first thing you say, about the US government printing money and the existing money becoming worth less, this is known as inflation.
Yes mining bitcoin is similar to printing money, however you cannot 'print' bitcoin infinitely as you can with US dollars. This is why bitcoin is known as a deflationary currency and many people think this is a negative aspect to its adoption, but if there was no artificial scarcity i.e you could make as many bitcoins as you wanted when you wanted then there would be no value to them whatsoever.
>currency gets destroyed buy (sic) governments Do you mean by inflation or do you mean they are putting it all in a furnace somewhere?
They destroy old used notes yes, but that doesnt take it out of circulation. if they burn $100million then they have $100million in fresh notes to go back out into circulation. That money comes from banks, those banks are holding it as deposits for customers. If the government 'destroyed' it then those people would not have any money in their bank accounts.
Far from destroying money or removing it from circulation many governments have been printing money like nobodys business over the last half a decade. Google Quantitive Easing to see the offical description of it and what they hope to achieve as a result.