There are many places to begin a conversation with Feargal O’Rourke.  The impact of a Trump presidency and the threat of trade tariffs is one. O’Rourke, an accountant, spent much of his career structuring the taxes of US multinationals who had set up outposts in Ireland; The Wall Street Journal credited him last week with having helped “design the country’s corporation tax system”.  He may have stepped down as managing partner of PwC, but, as the recently installed chairman of IDA Ireland, he still exerts much of his energy convincing multinationals to locate here.  Then there is the impending Irish…