Black walnut trees attract deer and other wildlife. The nuts are great food for them and the trees themselves seem to have a pleasant smell that many animals like. A liquor can be made from the green shells. I do not have the recipe but have been told it is an Eastern European tradition.
A good way to usefully dispose of a valuable seed such as walnut is to collect them in 5 gallon pails. You can walk down paths in the woods and scatter them. Most will get eaten but some will take root. I did this with red oak acorns about 30 years ago and I have many nice oak trees as a result. These acorns were carefully gathered by my daughter when she was young. We had a bucket of them so we walked down our paths in the woods and threw handfuls on either side.