You want to help the Native Sparrow species, you will learn how to ID an English Sparrow (which is an introduced, highly competitive, invasive species) and kill as many of them as you possibly can. Keep dumping feed in to the English Sparrows, and you are actively helping the invasive species, crowd out and drive off the Native Species.
Nothing wrong with shooting English Sparrows. The shooter has to be aware of exactly what he or she is shooting at! There are lists of birds that are considered pests, vermin, etc., and any acts you take to control them, generally either reduce predation or competition against the Native Species that they prey on or crowd out.