In that concrete instance (Birmingham), I see not the slightest reason for any restriction of free speech.

Wolfgang, your opinion on the restriction of free speech (by mob rule) in this case was not first sought. I suggest that it would not be sought when any other restriction of artistic expression was planned. Expressing your opinion that in this case there was no reason for its restriction - does not change the fact that it was wrongly and violently restricted, as were many meetings in 1930s Germany.

The fact that there may be occasions when you may have thought such restriction was needed and may have supported this - only makes it more likely that this restriction will be used (in your name) on other occasions - like this one - when you may not think that there was any need.

Sadly that is why there can be no real opt-out or degree - on supporting the right of others to freely express what may not be acceptable to you. For then the contol over what is - or is not restricted is passed to someone else to decide for you.

If you are not all the way with Voltaire - are you always (with no opt-out or degree) prepared to trust others to make the decision for you - on what artistic freedoms are restricted or not?