@Tfmonkey the Romans also used the swastika, as seen here in a mosaic found in some domus ruins. Perhaps the Nazis took the swastika from the Romans and not from Asia?
@blitzdriver but the Nazis literally travelled to Tibet to look for the Aryans among the Tibetan Buddhists.
"The Nazi use of the swastika stems from the work of 19th Century German scholars translating old Indian texts, who noticed similarities between their own language and Sanskrit. They concluded that Indians and Germans must have had a shared ancestry and imagined a race of white god-like warriors they called Aryans."
https://www.bbc.com/news/magazine-29644591
@blitzdriver Rome traded with India, and they probably liked it, but they didn't incorporate the symbol as Roman.
The Nazis did because they believed that the Aryans were located in Tibet and thought that Germans and Indians had some ancestral link via the Aryans.