Wise words Noah - let's hope he heeds them. Somehow I don't think he's in for the long haul though...which probably makes him somewhat more perceptive than the rest of us paradoxically.
Back OT - I believe your question was this:
My specific question. How is him traveling to the UK going to cause death and mayhem?
I would say that his particular schtick is one that - how shall we put it? - appeals to a certain type of individual for whom thinking and reason may not be the raison d'etre of their daily lives.
On the other hand though they make up for this in other ways - primarily in the realm of the physical.
Hearing that 'Islam is evil' and 'they want to take over the country' they are often inspired to take some direct action and - as there are large areas of immigrant communities readily available - these individuals often bring their talents to bear in the back alleys and byways up and down the UK.
It is odd you do not see a connection between hate speech by right-wingers and violence perpetrated by right-wingers but I think we can both agree that were Savage to be granted full access to their airwaves in the UK the hapless Brits would not be treated to an updated version of the Sermon on the Mount.
Here are some of the constituency that would be welcoming and supporting Savage - I happen to know the type quite well as I did spend my early years incarcerated in the UK and had opportunity to observer their depredations.
You may not be in the same position - not sure how familiar you are with the darker reaches of the blighted council estates there - but take my word for it...you should probably not trust these specimens with your lunch money. And by the same token they are very unlikely to say something along the lines of "I say old chap - this Savage blighter is a bit extreme what?"
I submit these specimens for your consideration:
These Nazi scum are already running riot. Already committing acts of violence.
The UK doesn't need more right-wing scum from the US in the mix encouraging them.
What happened your spelling improved that fast.Who are you kidding pal?