Israeli Pager Bombs

To make people like you cry.

Hezbollah is not “civilian” even though they hide amongst civilians.

Rule 80. The use of booby-traps which are in any way attached to or associated with objects or persons entitled to special protection under international humanitarian law or with objects that are likely to attract civilians is prohibited.
https://ihl-databases.icrc.org/en/customary-ihl/v1/rule80

Because Rat-bombs was WorldWar 1

Because Hezbollah was going to use them as military communication devices.

Because each and every one of those targeted "civilians" was a Hezbollah terrorist, in direct communication with other terrorists. Don't let them hide behind your skirts if you don't like it.