High inflation is simultaneously a tax easily collected by the government. If the majority of citizens do not use the national currency, the state will not be able to finance the projects needed by the country due to inflation (not all money is spent on corruption, some of this income goes to people 
).
You are talking as if high inflation is moral or even necessary but it is not, high inflation is bad for the economy, the governments and the people of the country and yet governments engage in it thinking they can control it very much like drug addicts that think they can control their addictions and like them they always fail and they drive the country to a crisis so big they can only get out of it by printing more currency and this wrecks the economy even further.).