Sderot is not 100% Jewish. Do you have any reason to believe that the non-Jewish residents of Sderot are being blocked from returning. Also, in 1951 Israel did allow many Arabs, if they choose, to return to their land. Are you unaware of that? As for your specific questions: 1) Yes it was a bad idea. The Jews made it clear that, absent attacks from Arab neighbors, the Arab population was welcomed to stay and to become part of the new Israeli state. 2) Yes it is a good idea. The Arabs in Gaza are shelling the town. 3) Coming home is not wrong. Many Arabs, who did not flee the state entirely, did just that. 4) Yes, Sderot residents Jews and non Jews will return rightfully to their homes.
PM postpones Israel-Germany summit marking 50 years of diplomatic ties (Haaretz)
from the article: IDF: No Gaza ground operation due to fear of war with Syria