Now that you've called me a fanboy, my loner complex demands that I disagree with you.
There is a danger to extreme opinions. Not everyone can be trusted to remain calm and peaceful when someone disagrees with them over a controversial issue, or over their own opinion. You can look at cases in history in which extreme devotions to concrete beliefs and customs led to conflict and widespread chaotic calamity. (i.g. Nazism, The Crusades, the KKK etc.)
It's better to have a mutual, if uneasy, discretion and timidity against controversy than to have disorder.
(Who am I kidding, I'm most certainly a fan-boy and I agree with you, but I love debates and I challenged myself to defend the opposite position.)
But still, some people are stupid/violent and should keep their opinions to themselves.