The Palestinians are simply Arabs in DNA, language and culture. Arab countries (Jordan, Saudi Arabia, etc.) have a majority of Arabs/Palestinians. The reason there is no separate country for them (the "2 state solution") is that they had a country after the UN partition, but wanted to destroy the Jews, so they started a war and lost.
This is what it boils down to me. If you want to settle an issue through war, be prepared to accept the consequences of losing that war, in regards to lost territory and sovereignty.
The article you linked to called it a war. Big difference. Ah yes, the 2014 war (not massacre) which broke out when Palestinian terrorists kidnapped and murdered Israeli children, and then their Hamas terrorist government would do nothing.
This article notes that there have been 2322 terrorist rockets shot into the Israeli town of Sderot, where these "war spectators" (the article does not say massacre) were from. So maybe they were glad their terrorist enemies were finally being supressed, hmm? Read the whole article and find out.