That's just you. In RL ever since WW2 nobody has wanted to use nukes (aside from some terrorists who fortunately haven't got them). It doesn't need to be any different in HxH. They really didn't want to use the nuke, and only used it when Netero died. If there's anything strange about this all, it's the fact nobody else but a small team of Hunters gave a shit about the ants - yet the Hunters cared enough to use a nuke. That disparity is kind of weird.