The government of several countries came to agreements for them to use fiat as a currency for trade because they can easily print it and manipulate the citizens with it and none of them will be punished for their actions.
Back days, other form of currency couldn't be manipulated because it's rare to see them and there was no much inflation. Humans are not satisfied with what they have, they prefer to take from others by trick. This is the same thing the government is doing with fiat currency that was made by them. The government is the problem not fiat (usd, euro, pounds etc.)
Is the problem fiat? I don't think so. Before fiat, there had been other forms of money that were effective. When the economy is mismanaged, more paper money will be printed to cover up for the poor handling of the economy. Instead of using financial and other resources to improve the economy, politicians prefer to sponsor wars.
Even if Bitcoin becomes the major currency, there will still be inflation in some countries because of poor economic management. The problem is not money but greedy, proud, and power-drunk leaders.
Politicians has always been the problem and sometimes they tried to put the problem on other things, they make people believed that the problem is not really from them. I think there should be a law to educate elected president on how to behave and handle the economy matters that has been put in there custody so that inflation does not increases due to so many mistakes made by these politicians and sometimes this can be as a result of grudges against other people/countries and political parties.
There is serious mismanagement of funds and unethical policies government are creating that will not favour the citizens or the average people, but they wouldn't care because they are in charge.
I don't see genuine reason why Trump have to attack Iran, I don't see a reason why Russia and Ukraine have to continue this war when it should have ended long time ago. I don't see a reason why Afghanistan will be at war with her closest neighbor. All these need to stop, the world need peace not conflicts.