Sderot parents on strike

After Israeli government failed to either stop Kassam attacks or fortify Sderot schools, it sent IDF troops to stay in Sderot schools for no reason, as live targets. Today seven Kassam rockets hit Sderot, and one rocket Sderot day care center. Sderot parents removed their children from schools.
Islamic Jihad declared the rockets to be “a gift for the new school year.”
Olmert warned of “severe response” to Kassam attacks and the government will not restrain the IDF. And indeed, Israeli government announced filing a petition with the UN to stop the attacks on Sderot. Mighty IDF is apparently not enough. Why would the UN end the Kassam attacks on Sderot, if Palestinians fight for the goal the UN supports: Palestinian statehood?