So thus far in the thread I think the leaning of opinion is that diversity is a good thing.
@simon would it be reasonable analysis to say that your concern for “yelling” is actually recognising that meaningful debate is one where people bring passion to topics of ‘weight’ ( that is relevance and importance)? Passion is the expression of emotion. Is the assertion that “everybody is entitled to their emotions without interference by others, everyone else has a duty to recognise that others have a unique set of valid emotions” valid?
@Gunnar - Can I ask what it is about this topic that prompted you to post after a long absence?
Also you appear to add the advocate a very centralised & emphasise a penal stance in attempts to provide a control solution. How would you address the enquiry or suggestion that this reduces diversity to the personal opinions of your moderator (s)?
@hellekin - could you expand on what you anticipate as not invented here problems? Currently its standing as proxy for intolerance of ideas (:. ‘diversity’) in my reading of what you have written
@Ed_S could you share more of your observations / thinking behind the comment that:
Does that confer any duties to any role holders? Does it suggest a need to ‘engineer culture’?
Ed when you note “troublemakers” Are you drawing a distinction between diversity of opinions within a shared spirit of giving mutual value and diversity of motivation in terms of seeking one’s own value at the expense of others? - I think that’s a future thread 
Thanx for contribution so far
Apologies of a missed any points or folk out of summary to date