Bad things can happen anywhere. A one-off incident wouldn’t make me leave.

I visit the US often and have been a victim of crime there more often than anywhere in Europe. That’s not to say I don’t love the US. San Diego is probably my favourite city in the world. But apart from one or two exceptions, large US cities suffer from far worse crime than anywhere in the UK. I got mugged at gunpoint by a crackhead in Philly. Quality of life can be fantastic of course. My aunt lives in a gated community in LA and drives to work so she never has to interact with the real world, so to speak, and her QoL is amazing. But large parts of the city are absolutely dystopian.

Try walking from Fashion District to Chinatown and tell me where you’d find something like that anywhere in London, let alone Z1. I don't even know if I've seen anything that bad in actual third world cities.