The swastika is a very old symbol, used by a huge array of cultures. Of course, one of those happened to be the Third Reich.
Time for some logic. Wheee!
(1) Eventually, given a long-enough span of human history, numeous evil powers and tyrannies will arise.*
*I know a lot of utopian internationalists seems to think that if we turn everything over to a central world government composed solely of themselves, everything will be fine forever. This, however, is about probability and fact, not fantasy, and is not an aspect of this discussion.
(2) These powers and tyrannies will have symbols to represent themselves. This has happened in the past and we simply don’t know or recognize them, or ignore them.
(3; 1+2=3) It’s therefore impossible to be “considerate” through the avoidance of all symbols, because everythinng is a symbol to somebody. Thus, any symbol used by anybody is treading on someone’s toes. Given long enough, all possible symbols will be used by somebody bad and thus using them would be “insulting” some group, I guess.
(4) Anything we like also must have a symbol to represent itself; to serve as an identifying mark, and which serves as an object of mental focus: exactly the same reason Bad Guys have theirs.
(7; 3+4=7) Eventually, given a long enough span, anyone who is decent will have no more symbols to use. They will need symbols but not have them available.
This is not really a good option, it seems to me. How can we purify symbols so that they are no longer associated with the taint of evil - in the particular case of the swastika, the Nazis? Thw swastika is a neat symbol, so how do we cleanse it of bad memories?
Edit to add: Wikipedia Link.