The principle of proportionality is explicitly about expectations, i.e. expected military advantage vs expected collateral damage.
You seem to be holding Israel to an impossible standard of guaranteeing zero collateral damage, which IHL does not require because no military is capable of that.
The latitude you wankers expect is absolutely incredible ... talking of impossible standards around "zero collateral damage" after what Israel has done in Gaza et al ...
Hezbollah was actively launching thousands of missiles at Israel when these pagers blew up. They stopped launching missiles at Israel en masse soon after these pagers blew up. What a odd coincidence.