It seems like these devices are being triggered to explode in a manner where there is some acknowledgement of a received message. Like reading the message on a beeper, not just having a beeper. The vast and sweeping majority of these are going to be detonating on people who are specifically working with them. I'd be surprised if there were more than a handful of incidents of collateral damage so far.

Really, the question needs to be about whether or not you want to target Hezbollah's non-militants. Yes we call it a terrorist organization, but it is also a full fledged political party in multiple states. Killing every single person in a party is wildly broad. So, the real question is: how does Israel know which of these numbers to target? I don't have an answer to that, but it doesn't seem to be a full scope, because they seem to be targeting specific cities.