What if the government of a country is irresponsible and issues a large amount of currency to buy Bitcoin?
I don't see this as being irresponsible. El Salvador has added bitcoins to their balance sheet for a couple of years now and other countries doing so would only make Bitcoin more popular among their citizens and grow adoption.
If some unscrupulous governments print a lot of money in order to repay debts and fight inflation, of course it will not be one time. Credit money no longer has credit.
Irresponsible money printing is one of the major reasons for the current inflation, printing more money to solve the problem would only make it worse and further weaken the currency being printed.