There are no two sides. I'm surprised, or should I be, that you've lumped everyone into two sides. There is the IDF with their rifles, there is the Israeli government, there is the Israeli people, there is the feda'ins with their ideologies, there is Palestinians protesting for the right of return.
Hamas and Palestinians are not one entity. The problem with arguments by some here is the stigmatisation of Palestinians wanting to, like you say, 'throw a nation into the sea'. What do they want? To get back to their town, get back to their home, build their house and live the life like they had previously. They care not one iota if Israelis from Russia or Poland rocking on next door to their house. It's not the first time they had Israeli friends in town. Palestine has already pushed for a two-state solution in 1950s, 1960s, 1970s, 1980s, 2000s, and early this year that follows the 1948 borders. Not a border all the way to the sea like you suggested. Israel will still have land of their own.
Palestinians are not asking for the first map. The 1948 borders will give Israel a sizeable portion of the land as per the UN Partition Plan. Anything is better to Palestinians than the fourth and current map.