Not saying publicity is bad - if it shows the other bad guys that the interception capability is there, all good.
- so you are saying it was good, then.
Well I'm not sure. If it's a transparent publicity stunt, you could argue that it will erode, rather than enhance the deterrent effect.
Military shows of strength have always been historically used to imply both ability and willingness to use said strength, but these days the link to the latter isn't so clear.
I know I'm contradicting my earlier 'all good' - I don't think it's that obvious either way.