The thing with buying filters for the Nifty is that it has a very small filter size, and filters you buy for it will not fit larger lenses you buy in the future. You could buy larger filters and step-up rings to allow them to be fitted to the Nifty but that is probably not the most appealing/elegant solution.
The Nifty can deliver good IQ in the right conditions, despite its many failings (build quality, AF speed, AF accuracy, noisey oeration, poor MF operation, dubious bokeh, flare, colour), so it's not that it doesn't deserve filters as such, but only get what you need, when you need it, and always keep one eye on the future. i.e. a 52mm CPL is going to be as much use as a chocolate teapot on any other lens, so if you want a CPL, work out a solution that protects your investment for the future.
The reason that enlightened people recommend avoiding (UV or clear) filters for everyday protection is that they really can degrade IQ, and if it's physical protection from debris and fingers that you want, the Nifty already has a fairly well recessed front element, and a hood would add to the physical protection and aid in reducing flare by blocking stray light from entering the lens.
As I said earlier, I own filters for all my lenses (bought before I became enlightened) and now that I know better I have stopped using them. I've seen the degrading effect of even a high quality filter, first hand, and many other examples on the internet that concur with my own experiences. If I was working in a harsh environment, with flying dust/stones/mud, sea-spray etc. then I would most likely fit my UV filters for protection, but for every day photography, wandering around the zoo or shooting a wedding I see no value in them at all.
Reference....
http://www.luminous-landscape.com/columns/sm-feb-05.shtml
http://www.vanwalree.com/optics/filterflare.html
http://www.birdforum.net/showthread.php?t=115953
If you Google for "UV filter lens flare" I'm sure you will find many more discussions on the topic.