Don’t let the fact that someone reprehensible stole a symbol for their own use make you abandon it. Just remember the original meaning. The svastika for example was originally an indus valley symbol of some kind, probably an offical government stamp. In the following thousands of years Hindi and Jain cultures have since adopted it and it can still be seen all over India as a symbol fortune (which is part of why the Nazis wanted it, a symbol of fortune and justification for their “reich”).
These seals date from 2600BC-1900BC:
For scale, this svastika is 1.75 cm across (according to the British Museum
where these are held).
Likewise the phrase “Ultima Thule” predates Germany by rather a lot:
“To the Romans Thulé, variously identified as Iceland or Mainland in the Shetland Isles, marked the extreme northern limit of the known world.” - Thule - Wiktionary
See here the Carta Marina (made in 1539 by Olaus Magnus, Archbishop of Uppsala, Primate of Sweden):
The map features an island labled Tile (a late latinization of of norse Þȳle: read thoo-lay):
The problem is that this island doesn’t show up on modern maps, even though the other island groups are well labeled (which is quite strange since the map seems to say it has a population of 30,000, “XXXMILLIA”)…
It is still not certain why this is the case. Although, probably, this is merely a cartographical (or transnational) error, and “Tile” was just another of the islands of the Orkneys. At the beginning of the 1900s however, its absence was a source of occult mystery.
It was this mysterious nature that attracted the attention of an occult group, who even named themselves after it: the “Thule Society” (founded 1918). They postulated that there was a magical “shangrala-like” land at the north pole where people could live 1000 years. They based this idea off ancient Greek accounts wherein the mythical land of Hyperborea (land beyond the northwind) included an island called Θῡ́λη (thuli). For a more familiar example, you might think of Thule as being like the “lost city of Atlantis”, where secret magics might still be found (at least according to the occultists… who were basically the flat earthers of the day).
After the Nazi party was elected, the leaders were eager to write themselves into the history and mythology of the world. They used the Thule Society knowledge of global legends of artifacts of power and ancient historical accounts to justify their right to rule. They also plastered various ancient symbols all over their paraphernalia, including svastikas (a symbol of what they called “Arian” people, i.e. the indus valley people,… i.e. the original “master race” from who they are supposed to be descended) and the eagles from roman battles standards (an allusion to Rome being the 1st reich and Germany continuing that tradition… basically just another claim to ancient entitlement). The reality of these claims is beyond dubious, perhaps even laughable, but they didn’t let that stop them.
The Nazis spent a ridiculous amount of effort hunting down art and artifacts, either to fund their war, to enrich themselves, or to write themselves into the history of other cultures. In any case, they had no more proper claim to these cultural symbols than they had claim to the paintings you still see being returned to their original owners. It would be tragic to abandon something nice forever just because some jerk once lied by saying it belonged to him.