How does devaluing a currency help a government deal with it's national debt?

Devaluation only helps with tourism ( from nations with stronger currency). It also helps if one buys said currency with the hopes that the currency will rebound at a later date. If a government completely disregards the gold standard and counterfeits their own bills, then the world market will eventually disregard said bills. Then a cascade effect occurs and that nation's interests will be liquidated to the highest bidder. At some event horizon, the nation loses its identity and the government thereof runs away to pontificate about how to spend its time