That's the only option they have. They possibly cannot hope to win the fight against the Israelis or inflict enough damage for the Israelis to reconsider their approach. The only offensive weapons Hamas had, Rockets and Tunnels have been largely neutralized by the Israelis. There is literally nothing in the Palestinian tool kit that they can use to pressure the Israelis for a settlement. There best bet is to disarm and hope there is enough international pressure on the Israelis to force a settlement.
What world are you living in? It were the Palestinians who killed the Oslo Accords, not the Israelis. While i agree the terms were harsh on the Palestinians, but that was the best they could have gotten at that time. Guess what, the terms Israelis will offer now would be even harsher. Here go read this up, that should refresh your memory:
Failure of Palestinian leadership to read political realities and Israel’s culture of impunity ended Oslo long ago.
www.aljazeera.com
And you're acting stubborn with a massive ego like the Palestinians had, and look where they landed. Its important to read the reality on the ground. The Arabs have largely abandoned Palestine, they are in the process of normalizing diplomatic relations with Israel. They are largely becoming irrelevant only due to their stubbornness and not realizing what reality looks like, just like you, so by all means, keep crying.
Its better then what they have now or what they will have in the future. So by all means, don't disarm but don't cry as the Israelis pound them with absolute impunity. Only a fool fights a battle they know they can't win.