Do we know the context his statement was made in? (I have not personally watched the interview, if that's what it is from)
Like in your example, yes, you sound "crazy" (for lack of a better term) in giving advice on Brexit when you know nothing about it. But what if you tell me you know nothing about the UK, but then I still push and ask, "Well what do you think they should do regarding Brexit?" So in your mind, you answer they could go forward with it because you've heard a snippet of gossip about it, and know that it seems people want that to happen, so rather than lack an answer to a specific question, you just throw an idea out.