Imagine that some respectable country would go far beyond legalizing cryptocurrency and start one of its own. It would surely be no scam and it would probably have a strong support, but would there be any drawbacks to the currency and the state itself? Would it get more attention than some of the biggest coins now?
I will not investing on a coin that is issued by a government because probably, it will just fail in the future since other people hates government taxes and they will not support a coin that is created by the government.
That does not sound a logical reason. The logic behind investing in a coin issued by a country for example USA is the coin will have a very low or zero default risk. As a result, people will invest in the coin because the risk will be minimum and the coins backed by government are normally of high return. Like the bonds issued by a government are preferred over those issued by a company. This is the reason.
The risk will not change if you will be investing into a coin that is presented by a country because we all know that it is still cryptocurrency and the cryptocurrency used to be a volatile cryptocurrency and because of that thing then you might still lose the same amount of money like how much you lose to other coins.