It is too early to say anything definitive about the Hamas decision to apparently break the ceasefire and attack an Israeli position, except that if it is true, as reports indicate, that Hamas militants came through a tunnel and carried underground and back into Gaza a live Israeli captive, then this moment could represent not another terrible, dispiriting incident in a terrible, dispiriting mini-war, but a fairly decisive turning point in which all swords are unsheathed.
This is assuming—as seems probable, but not 100 percent certain—that this raid is even what the Hamas leadership wanted (for what it's worth, its leaders, at the moment, seem to be owning this raid, suggesting that they are indeed doubling down in their war on Israel). If the events of earlier today happened as initial reports depict, then Israel will consider this incident an engraved invitation from Hamas to launch something close to a full-scale invasion of Gaza. Here are the factors that could lead Israel to decide to go all-in:
a) The compact between the Israeli army and Israeli parents is simple: You give us your sons, and we will do whatever we can to keep them alive. This includes conducting operations that get other soldiers killed. There will be near-unanimity in Israel that this soldier should be rescued, regardless of price to Israel, or certainly to the Palestinians in Gaza.