You are wrong when you say that Israel must accept responsibility for causing the Palestinian refugee problem. It did not and therefore shouldn't accept responsibility,. It always amazes me how Palestinians refuse to consider the context of the refugee problem and the 1948 war. Palestinian Arab leadership in 1947 rejected the Un partition plan and instead launched a war throughout mandatory Palestine against the Jewish population, killing hundreds of Jews. That leadership called on neighboring Arab states to invade Palestine to prevent Israel's birth. Israel fought for its existence and won the 1948 War of Independence. By rejecting compromise and fighting to destroy Israel with help from the neighboring Arab states, the Palestinian Arab leadership deserves the blame for all that ensued, including the displacement of Palestinian refugees. That's where the true blame lies; not with Israel.
Turkish army: 2 ISIS fighters killed in U.S.-led coalition drone attack in northern Syria (Reuters)
from the article: Hope of return keeps the Palestinian refugees going