Just because it doesn't cure one thing, we shouldn't consider it for others? Should we toss our antidepressants because they don't cure respiratory infections?

Just because it doesn't cure one thing, we shouldn't consider it for others? Should we toss our antidepressants because they don't cure respiratory infections? I believe there's a plausible mechanism in this case, and related studies on respiratory infections where an effect was found. Also, in terms of studies, often the no effect data is from bolus doses, which don't seem to do a good job moving the needle.