Well for one, if the police are looking for the killer, it helps to have an accurate description to go by. Therefore, one could conclude that the person giving the description had no expectation or want of catching the killer.

Also, it shows the lengths that some will go to inject their racist views into a situation that had to place for racism. While the sister should have been concerned for her sister and family in general, it shows that her hatred of those of a different race is more important to her during what should be a time of grieving.

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To argue with a person who has renounced the use of reason is like administering medicine to the dead - Thomas Paine

A lie doesn't become truth, a wrong doesn't become right, and Evil doesn't become good, just because it is accepted by the majority. - Booker T Washington