No one does something for no reason, that includes terrorists. An enemy force will use a tactic because it's successful. Which is why there's only way to stop them from reusing that tactic, render it a failure.
Each time that happens, and the use of human shields is successful-- we're insuring that human shields will be used again. It's like paying ransom every time pirates seize your boats. It turns an individual crime into a profitable venture, and creates an entire industry built around it. So too when civilized countries directly or indirectly reward the use of Human Shields, it increases in scope and becomes a vast problem.
In Lebanon and Gaza, Hamas and Hizbullah built much of their defensive strategy around placing high priority targets and weapons embedded around facilities such as schools or hospitals, betting that either they would not be bombed, or that bombing them would enable them to pull off a media blitz that would force Israel to withdraw and sign an agreement. Both times their bet paid off.
Such tactics were not unprecedented, but nevertheless Hamas and Hizbullah used Human Shields as a defensive strategy on a scope and scale that demonstrated just how vital it had become. Hamas and Hizbullah understood that they could not defeat Israel on the battlefield. The one ace in their deck was the civilian population they could employ both offensively and defensively. While the US had disregarded Saddam's use of Human Shields, rendering it a virtual non-factor by Baathist forces and terrorists-- Israel failed to do so, and was rewarded with a more extensive use of Human Shields than ever.
The problem is that rewarding Human Shields strategies quickly lets terrorists know that they can use entire populations as Human Shields. The more you allow it to succeed, the larger the use of Human Shield grows, as terrorists begin using thousands to protect high value targets. The end result of failing to suppress the use of Human Shields is that soon you're dealing with entire populations turned into Human Shields.
President Jefferson understood that the cycle of ransom and kidnapping could only be broken by cutting through the pirate's premise, that kidnapping would result in rich rewards, rather than death. Terrorist groups who use Human Shields must get the same message, that this tactic will no longer grant them any special protection. That media outrage will make no difference and that soldiers will do their job regardless of Human Shields. Only then will terrorists begin to see Human Shields as a useless handicap, rather than as a handy defense. And only then will the use of Human Shields and the civilian death toll that results from their use, finally come to an end.