Does this mean backyard bird feeding is wrong?
No. However, you should not feed birds when there is reasonable assumption that any animals may come to harm. While feeding birds in your backyard is generally not an activity that fits into this category, some conditions may warrant curtailing the provision of such food sources. For example, during the warmer months, when natural food sources are more readily available, it's usually best to reduce the amount of feed you put out each day or suspend feeding altogether, especially if deer, bears or other animals are getting into the feed.
Remember that it's also important to maintain safe, clean feeding stations in order to prevent the spread of disease.