>>8622957no and no to both points
diversity will only bother you for as long as you choose to be racist. studies have been done on your claim that it ruins "social cohesion" (just google contact/conflict theory)
yugoslavia dissolved after Slobodan Milosević tried asserting serbian dominance over the other sovereign republics (he did this by overthrowing governments against what the constitution said). i.e. it fell apart because of ethno-nationalism from a small minority of people, not because it was "too diverse"
