Basically what the title says. Why did the Nazis use an established symbol in the east (india) with other meanings attatched to it rater than a more descriptive icon in relation to their motive. Taking the example of the USSR flag, it showed the hammer and the sickle representative of the fact that it is a country of the common peasant (although it wasn't the case).
Edit: decided to ask on this sub as I couldn't find any proper reasons and found just theories online
It is a descriptive symbol in the context it was chosen. As detailed in this older answer it had been used within far-right, anti-semitic groups since the late 19th century, so was a readily understood symbol that telegraphed the Nazis' politics.