On the positive side this weapon cannot be used again. Hopefully people check their devices and any other type of explosive will get caught before it can be used as well.
My guess is this is psychological more than anything. Israel found a very sneaky attack vector and use it to make themselves appear stronger than they actually are. Acting tough is a sign of weakness. This is Israel trying to intimidate the Lebanese people and make Hezbollah look weak and compromised. If people just ignore this, check future electronics for explosives, and continue to resist Israel then Israel will fail its goal.