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Multi-culturalism and integration are two exact opposite themes.
To add to it, in the case of the Folkestone scene, they were all from the same cultural background, from the same country.
One could consider Lebanon, where the people are largely of the same ethnic origin, have been so for centuries, and speak the same language, and yet are strongly entrenched in different groups: Christian, Sunni and Sciite, and also Druids. If something goes wrong in the precarious set-up of the government, the whole area risks igniting.
Another case was Bosnia, with people speaking the same language and ethnically very similar.
In these two examples, we can see that the people who inhabit the same area are practically of the same ethnic origin and speak the same language, and often lived in the same streets.
In each case, in Lebanon and in Bosnia, there are different armies or armed forces, or different divisions in the same army, based on diverse factors that we in Britain cannot comprehend.
Many African countries have a similar internal division, based on tribal distinction, even though they often speak the same language. Somalia, Congo, Nigeria, and quite a few other African states where wars or violent uprisings have flared up all over a sudden, taking the whole world by surprise.
It's not that easy to secure either multi-culturalism or integration.