Too bad innocent bystanders were killed, but in war everything is both immoral and fair. Yes, immoral and fair. Once you accept the idea that war is immoral by its very nature, then any act of war and any kind of weapon is perfectly legitimate.
At least 4 die in clashes between PKK militants, security forces in east Turkey (Reuters)
from the article: Panel to look into civilian deaths in 2002 IAF attack on Shehadeh