The 'buffer zone" as you call it is 100% inside Gaza, not in Israel. Not Israeli would have any right to be there without violating what Israel claims is not Israeli territory.. Nonetheless, the shooters (of 20) people just probably picked dozens of votes or more for the Abbas statehood bid. Well Done. Now imagine the IDF not shooting somebody in Gaza on their own private land.
from the article: Palestinians: One killed, several wounded by IDF fire on Gaza border