I don't see the tunnels as a threat for the kind of long term guerrilla warfare you're suggesting, at least, not once Israel has finished bombing and clearing them, or flooding them, or filling them. And, I would say it's because of those ~2,000,000 people that such an aggressive campaign against the tunnels and Hamas is necessary. The longer Hamas is able to stay combat capable holed up in tunnels, dragging it out, the more innocent Palestinian's are going to die, which is absolutely fine by Hamas, but I think genuinely not fine by Israel and the world. Ending this as fast as reasonably possible, even if it's at the expense of tens of thousands of additional dead civilians, is preferable to a slow, drawn out conflict, which would likely kill hundreds of thousands of people. For anyone following along, six figures > five figures.

With martyrdom, I'm not so much talking about the typical extreme Islamist suicide-bomber type of martyrdom, I'm talking about the Hamas-brand Martyrdom,™ where they block evacuation routes, tell people the evacuation calls and warning are hoaxes, and tell people to go stand on the roofs of their buildings to stop the IDF from bombing them, as well as when Hamas members and loyalists force their extended families and friends and neighbors to live above the tunnels, to have tunnels under their schools and hospitals, or even to huddle around them as literal human shields. Then, when they all get killed, Hamas comes to the international community all shocked Pikachu and says "how could the IDF do this?"

Indeed, October 7 was not going to liberate a single Palestinian person. I'm still waiting for one of the local Hamas supporters to explain to me what they thought was going to happen and how that attack wasn't just handing to Israel the justification it needed to fully annex Gaza and destroy Hamas to the man; did they not trade any hope they had for statehood just to kill 1,200 civilians and first responders?