Because Israel views Arab refusal to recognize Israel as a Jewish state as the core cause of the Arab-Israeli conflict. For most Israelis, a two state solution that results in a Judenrein Palestine and an Israel comprising a large Arab fifth column is correctly unacceptable. The concurrent idea of a land swap would automatically convert your so-called Arab sub-citizens into full citizens of Palestine without them having to leave their homes. Abbas and his coconspirators categorically refuse to discuss these ideas because they have no desire for any sort of peace that results in a sovereign Jewish state.
India hangs only man sentenced to die for 1993 Mumbai blasts (AP)