Other more earthy and economical reasons included the hope that the House Sparrows would consume the Green Worms that were damaging the foliage in Central Park, or eat the grain in the mounds of horse manure and expedite the composing process, or they would consume the bugs that were destroying the crops across the country. Were the House Sparrows effective in completing their appointed tasks? That is unknown.
I really don't think of the House Sparrow as a nuisance, but then there is the European Starling. Now, that is another story. They, too, were introduced into Central Park, NY when 80 to 100 birds were released in 1891. It is thought that over 200 million European Starlings cover the landscape from coast to coast with as many as 100,000 birds gathering in one flock! That is a nuisance, especially when they land in your yard! There are only three birds not protected by the U.S. government. These are the House Sparrow, the European Starling and the pigeon. Despite the lack of protection, these species are here to stay.
From my perspective, I would be really happy to see some House Sparrows move into my yard. Then again, I might be even more obsessive about staring out my window for fear I might miss a rare bird drawn in by the HS magnet.