but why would the tour be cancelled?
Possibly but not necessarily. Too soon to know at this stage. For all we know, he may not be allowed to leave the state or could stay in jail. Maybe they'll toss him out of the country. Or, most likely, he'll be forced into rehab which, at best, may postphone the tour.
If the tour does go on, I would bet anything this would make it your last chance to see any kind of Peter Murphy tour in the US ever again because they probably would deny him a visa for future visits or maybe he'd choose to stay out altogether.
Interesting note: Way back in the early '80s I knew a girl in Lancaster who was friends with the girl he married. Her father was a judge. Wonder if he's still married to the same woman and how that relationship is going and if said father-in-law will intervene?
Was there someone in the car he hit?
Yes, read the article I posted in the lead-in to this thread.