In a repeat of events in 2008 (and earlier) Hamas stepped up its rocket attacks from Gaza against Israel. Israel, not surprisingly, responded with attacks of its own. In addition to the political and humanitarian concerns, this matter raises numerous ethical issues.
One issue of concern is that Hamas generally locates its launch sites close to or in civilian areas. As such, Israel runs the risk of killing civilians when it attempts to destroy the launchers. This raises the general issue of launching attacks from within a civilian population.
On the face of it, this tactic seems to be immoral. To use the obvious analogy, if I am involved in a gun fight and I grab a child to use as a human shield, I am acting wrongly. After all, I am intentionally endangering an innocent to protect myself. If the child is hurt or killed, I clearly bear some of the moral blame. While my opponent should not endanger the child, I would rather limit her options if I kept attacking her while hiding behind the child. Naturally, if I was shooting at her innocent children while using a child as a shield, I would certainly be acting very wrongly indeed.
One possible counter is that the analogy is flawed. In the child example, the child is coerced into serving as a shield. If the civilians support Hamas and freely allow themselves to be used as human shields, then Hamas would not be acting wrongly. To use an analogy, if I am in a gun fight and people volunteer to take bullets for me by acting as human shields, I would seem to be acting in a way that would be morally acceptable. As such, as long as the civilians are not coerced or kept in ignorance (that is, employed as shields by force or fraud), then it would seem that Hamas could be acting in a morally acceptable way.
There is, of course, a rather obvious concern. To go back to the gunfight analogy, suppose my fellows volunteer to serve as human shields while I shoot randomly at my opponent’s friends and family. If my opponent returns fire and hits one of my shields while trying to stop me, it would seem that my opponent would not be acting wrongly.