"The [problems] it brings far outweighs any good IMO which is seen many times the world over."
There's the rub, though, in hat we have a difference of opinion. I suppose it inevitably will be influenced by life circumstances, but in my daily life I spend time with a Belgian, a Swiss, an Iranian, an Israeli (yes, really!), an Italian, a German, an Indian, a Swedish/ US joint national, and a Mexican (among others). I share my flat with a Russian and another Mexican, as well as someone from London. We all get along brilliantly, and the mix of cultures and skills has enriching potential. That allows me to see the benefits of multiculturalism (and, yes, possibly obscures some of the problems).
I'd rather see that kept going, and while there may be problems that go with it they are not insurmountable. In the short term, as we have seen recently, things can get messy. But, really, this is an indirect consequence of multiculturalism. There will always be people willing and able to commit horrific acts of atrocity.