I have long thought that in our modern day culture it is almost illegal not to have an opinion on an issue regardless of whether we know anything about it or not.
Confident ignorant people argue with equally confident ignorant people.
We all do it.
In the UK for example, how much does any one of us really know about the impact of a complex issue such Brexit - but we all have strongly held opinions.
I've long been meaning to write about this but Omid Safi has beaten me to it in this article The Wisdom of Saying “I Don't Know”