What about neo-classical architecture, which the Nazis loved? What about white marble sculptures? What about the colors red and black?
They used many symbols. Letting them be the owners of them gives them legitimacy. Why do we want people looking at old art, seeing a swastika, and then having the thought that the Nazis actually have a cultural association with that? They don’t. They appropriated cultures to give themselves legitimacy. Allowing this to continue furthers their goals. They don’t own the swastika, eagles, fasces, neo-classical architecture, appealing to Roman culture, or anything else. They stole it all, and continuing to let them own it is an issue.
88 isn’t really the same thing, although, like you said, some people perfectly innocently use it, which is why it’s a dog whistle. 88 became a thing when Nazis had to hide they were Nazis. The swastika is not that obviously.
Why they dropped the symbol is likely because people were using it to say the Finnish government were Nazis, like th comment above implied. It’s an easy target for people like Russian apologists to say “we’re denazifying Finland” or whatever, while they do plenty of actual fascist shit.
Symbols are as useful as they’re interpreted. If they’re interpreted wrong then you should probably change them. It doesn’t mean we should allow people like the person above to imply anyone using them is a fascist. They should be countered and shown how stupid their arguments are. I have no idea why you’re defending them.