War Spending
The money spent on excessive wars by nation-state regimes is a colossal tragedy. Excessive war includes armed conflict beyond critical defense and prolonged military campaigns with unclear objectives. These enormous sums of wasted money could have either been: A) spent in a productive manner to improve the life of citizens (e.g. education, infrastructure), or B) not taken from the pockets of citizens in the first place.
The use of public funds to engage in excessive war is a fiduciary breach of duties by elected tax spenders. Stated differently, one of the key responsibilities of elected representatives is to ensure tax dollars are spent appropriately, particularly when human lives are at stake. Any government that uses tax dollars to engage in the destruction of human life beyond critical defense instead of the improvement of human life should be held legally accountable for breach of their fiduciary duties.
The 2001-2021 US war in Afghanistan is a prime example of an excessive war. In addition to the human tragedies and lifelong trauma caused to the people living in Afghanistan as well as the troops who were deployed there, the war cost is estimated around $2.3 Trillion, or $2,300,000,000,000. Other potential uses of $2.3 Trillion of tax revenue include.

Sources:
Costs of War | https://watson.brown.edu/costsofwar/figures/2021/human-and-budgetary-costs-date-us-war-afghanistan-2001-2022
Cost to End World Hunger | https://borgenproject.org/cost-to-end-world-hunger/
Literacy | http://uis.unesco.org/en/topic/literacy