In this particular case it could be to just keep it as its silence meaning. And more generally it could be associating it with more positive symbols like the lgbtq flag, or a socialist rose in France (this is a poor example because the fren socialist party always betray but it is the spirit). If each time they start to use a symbol we stop using it, they the only possibility left for the symbol is to be for the far right. But if you keep using it for the original meaning, it should be good. It happens with the triskell (beton symbol). It was used by a SS section from britain but now it is still used to represent Bretagne (like the gwen Ha-Du)