Some Orthodox Jews are very active against it, on very sound religious grounds.
They play a major role in politics. Most prominently and recently, the 8-decade long exemption from the draft for Haredi Jewish people was ended causing a major crisis in Israel's government. All Haredi representatives of the Knesset withdrew leaving Netanyahu's party's majority with a razor thin margin of 61 seats in the 120-seat Knesset
Trust me, no orthodox Jews are opposing the Gaza conflict on humanitarian grounds. On the contrary, there is a STRONG orthodox faction in Netanyahu's government (of which Smotrich is a member).