Islam is a religion of peace. UK can certainly benefit from this philosophy of Islam. That is what the Archbishop is alluding to.
I can see that. The UK was horribly violent before Islam burrowed in like a parasite to bring peace and calm to the land by turning English spirit to mush and English attitudes towards meek compliance with political correctness.
All is better now that England no longer defends its culture and values. See peace can be bought through subservience and acquiescence.
UK does have a history of extreme violence. Brits killed millions of people in Asia and Africa in the process of colonization. So I think letting Islam into UK will be a good thing as it will temper the violent British tendencies.
You seem hostile toward the Brits.