In certain quarters he probably risked being torn 'limb from limb'
As several have commented already - if he was stupid to wear the T-shirt in Worcestershire, he'd have to have been suicidal to have worn it in Liverpool.
But that fact in itself reveals an interesting albeit depressing angle about the mindset of some people.
Further thought: if someone is arrested for wearing such a shirt (or carrying a banner/placard etc.) and they are charged with inciting violence (upon themselves, by others), who is at fault - them for displaying a message deemed offensive, or the others for responding to words with physical violence? To me it says something about people that they don't meet offensive speech with other speech but with physical aggression.