Lets see you're hauled off from McCarren Airport to the local lockup while you're possibly charged with immigration fraud, put into a cell for however many hours, possibly get a stay in a lovely Las Vegas jail for a few weeks and then shipped home, banned from the US for life.
Or you could go through Dublin where they do pre-checks and in that case you'll just be refused there and hop on the next flight back.
This is of course if they find out, which I doubt they will.
Was your case in the papers? Have you been to the states before? Answer no to these and I would answer no to their question.