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If this ISIS avatar is illegal in several countries around the world, then either block those countries IP addresses from accessing this site so this guy can keep his avatar, or ban his avatar.
Alright, while we are at it, lets ban bitcoin. Its illegal in several countries as well.
The argument is not legal vs illegal, the argument is about us (as a group) working on public perception about something we believe in (crypto). Self regulation will go a long way to improve global adoption and to get there we need to win public opinion. Allowing criminals and terrorists in our midst will not advance that perception in any way. Why even consider allowing it?
If you start to give up freedom for security the terrorists have already won. Baning the symbol will change nothing, but sweep it under the rug.