Was the creation of Israel in 1948 a mistake? Perhaps.
But it exists now, so let it be. Most countries in this world are artificial construct, the borders of practically all of them were determined by war, many even by offensive conquest aimed at exapansion. In that regard the Israeli case is a bit more complex, since most of the wars Israel fought were wars of survival.
Yes, it is a Zoinist and Jewish state. But there are already more than a million Arabs/Muslims living within that state. They probably have more freedom and a better standard of living than in any arab country. These calls for war and the destruction of Israel will only lead to more war and suffering. Arabs have tried a few times to eradicate Israel and failed, losing land in the process.
Tough luck, they took a gamble, and they lost. Live with it. If you want to have progress and development, war is not the best method.