Except for when that symbol represents something so atrocious to so many people, that its original significance has essentially been replaced. As a Jewish person, I can tell you that seeing a swastika will always evoke a visceral response from me and from every Jewish person I know, (and we have had many conversations about this, believe me). I am well aware of the peaceful origins of the symbol but couldn't care less about them when I see one in front of me.
As for changing the significance of a symbol to something good, once it's been tainted? Nice idea in theory, but never going to happen. Just like the souls of those who were slaughtered in the Holocaust or during this country's period of slavery will never be brought back to life. And those who feel a close connection to a given symbol either by heritage or by culture will likely never be able to associate with anything positive, nor should they be expected to. And we need to be sensitive to that. When you mention symbols that evoke rememberances of times in the history of the Earth in which human beings acted no better than demons from hell, it doesn't matter much anymore what else they could possibly mean to anyone.
The other thing at play is what people actually mean today when they display these symbols. When we see a Confederate flag today, we think that somebody is trying to display pride for the South. But it seems to me that there are many ways to do that that don't include flying a flag that, 150 years ago, represented (among other things of course),the desire to keep slaves. And if someone in the West is wearing a swastika, come on, we all know what that means.
So as arbitrary as these symbols are, at some point in time they took on a new significance. Maybe a Confederate flag has nothing to do with slavery for a given individual, but in our culture of both past and present, the connotations are there. A swastika is a far more clear-cut case (and by the way isn't the best analogy for the Confederate flag situation), and it should never be tolerated unless it is absolutely and positively clear that its use is directly and intentionally connected to Buddhism and even then it is quite a risk.
But this example exists on a completely different scale and is a universe away from the swastika debate and even the Confederate flag arugment. People will always find things offensive. Actions, slogans, words, whatever. Clashing cultures, values, and opinions will always cause tensions and discomfort. But when both the significance and the consequences of these actions are relatively benign, then all we can do is try not to hurt others, but not worry too much when it inevitably occurs in these kinds of settings. Again, this can't be compared to symbols representing extermination and slavery.
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