As we've discussed all this before, I was reluctant to go over old ground but.....
There are/have been animals in Loch Ness which should not be there. They were first reported in the 5th century when---I'm pretty sure---tourism was not an influencing factor. To say, simply, that "The Monster" doesn't exist is to say that over 3,000 witnesses---including doctors, lawyers, monks, M.P.s, policemen, gamekeepers and fishermen who have lived there all their lives---are either liars or mistaken. As G.K. Chesterton once said, " Many people have been hung on less evidence than there is for the "Loch Ness Monster".