Soldiers never really analyze in detail why they go to war. They are induced to do so by pressures due to their upbringing, their families and some misguided morality that says they have to fight for the country otherwise they are not good people.

Wars can be alleviated through diplomatic means. The point being is that these means are never really tried, despite the Chamberlain illusions about Hitler.

The reason that they're never tried is because of the armament industry which capitalizes
on war and has too much power in the US.

In he case of WWII, though Hitler was out of hand and psychopathic, there were too many institutions, banks, agencies that supported him in the early days in both the US and Britain.
Bank of America is one.