I think this will have the opposite effect than you think it will zuglo9.  I think any potential racist sitting on the sidelines will see what the antifa protestors did with the mace and clubs and will be inspired to join the cause.  And considering that antifa brought weapons, the number of weapons from the white supremacists will also increase.  It is a sad spiral we are on.  A sad sad spiral and limiting free speech is not the answer.  People do not react well to be doing told what they can do and think.