Though Israel, as a rule of thumb, doesn't comment on allegations of spy networks connected to it, Israel's enemies should remember the country has one of the strongest intelligence apparatuses in the world and is capable of neutralizing targets anywhere. Israel is very precise, and it only targets high-ranking terrorists who are responsible for killing swathes of innocents.
Regardless of what men like Saleh al-Arouri were accused of, Israel has no right to violate Lebanon's sovereignty so flagrantly. For almost all of Lebanon's modern history, Israel has disregarded international law in its constant attempts to sow discord in the country. Israel has an interest in keeping this war going, and the international community must do more to prevent it from further attacking Gaza and Lebanon.