The OP uses the Italian fascism symbol. Hitler's appropriation of the symbol for the sun - taken from Hinduism, Buddhism, and Jainism (and apparently in some places in Africa, too) - can also be used to explain it: it has forever changed the _associative meaning_ of it - and now the symbol (legally banned in Germany outside of historic educational/research context) evokes images not of sun workship, but of the worst evils committed by mankind: gas chambers with scratch marks of human fingernail, human skin turned into lamp shades and piles of starved bodies, tens of millions dead one way or another (holocaust and WWII). That history leaves a sad, repulsive, shocking and painful memory imprinted on one's brain (assuming one has some empathy and conscience), and seeing the symbol in the 19th century would be quite difference in comparison; this memory association cannot be "un-thought" (and as moral obligation, shouldn't!).
On a related note, looking at the European elections, it is shameful and beyond believe that some want to turn back the clock (actual fascists) or to protest-vote like the folks did in the 1930s (coward followers).
Leech, Geoffrey N. (1981) _Semantics: The Study of Meaning_ (2nd ed.), London: Penguin).