Swastika predates the nazis by a lot too but I wouldn't put one on my leather jacket. Seniority is a weak position when trying to guess what meaning people might infer from a word.
The swastika is associated with a group that waged a major war against many nations and committed genocide and other atrocities. Avoiding it, at least in most contexts, is just good sense these days. "Q" in "QAnon" is associated with a bunch of idiots believing nonsensical conspiracy theories. These aren't quite the same things.
Giraffe makes a good point. Idiots believing nonsensical conspiracy theories became Nazi's after all. It's a slippery slope. It is completely fair to compare them. Crazy is crazy, regardless of which one is "worse".
So let's stop using the letter Q for systems related to "Q&A" services because some idiots might associate the Q with another group of idiots who have managed to accomplish nothing of value and most people know are idiots? That's idiotic.