The Nazi Party and German war machine was much more than one man. And Hitler and the Nazi Party didn't use the symbol because peace "pissed him off". It was because of their adoption and mythologized perversion of the "Aryan race".
Go look up Krohn and Guido von List and the lengths Himmler and the SS went to investigate the occult and attempt to validate their new age bullshit.
One of the folks that Hitler read about was Aleister Crowley. And some Madame lady, I forget her name, however this is where the Aryan race concept planted itself in Hitler's mind.
Hitler and the Nazis were a lot like a all girl sleepover trying magic with each other, but instead of "Light as a feather, stiff as a board" it was "White race, kill all Jews" concept.
The Svastika, or Swastika is it's commonly known in English, is a bent cross, a symbol used all around the world to represent the four elements, cardinal directions, seasons, etc. It was used in India to represent
yang, male, the sun, and reproduction and the right, the direction that it faced. It's left-pointed counterpart, the Sauvastika represented
yin, female, the moon, and fertility.
The Svastika was not used by the Nazi party prior to it's takeover by Hitler. It was the symbol of the Thule Society, a group that Hilter was not a member of. The Thule Society traced the German "race" back to the Aryans, an Indian ethnic group, which was why they used the Svastika as their symbol. They were primarily concerned with uncovering pre-Roman German history. It was one of their members, Rudolph Hess, that introduced these ideas to Hitler and helped shape his racial ideology. Although the Thule society itself was not racist or anti-semitic and one of it's prominent members spoke out against them.
Heavily influenced by Nietzsche, Hitler saw himself living in the age of the Sauvastika, an age characterized by the philosophy of the Enlightenment. Hitler chose the Svastika as his revolutionary symbol to usher in, as Nietzsche proclaimed "a manly, war-like age" that promoted materialist objectivity and science and dispelled superstition (unlike the occult Thules and H. Himmler).
Even though Hitler was a racist, even his use of the Swastika was not itself a symbol of racism. It has honorable roots in history and is a powerful symbol that many people are trying to reclaim and shed it's bad image.