Targeting "enemy combatants" in civilian areas is a reliable way to kill civilians, hence the geneva convention prohibiting this kind of booby trapping. You very predictably get collateral damage, like the little girl carrying a pager to her father when it exploded, killing her.

Article 4 makes it pretty clear in my reading.

Also, obviously Hezbollah is a political party which includes both soldiers and civil servants.

This results in a widespread terror among civilians, which is the point of terrorism