Both Israel and Egypt hate Hamas. They're the ones who have to deal with Hamas on a daily basis and know them better than anyone, certainly better than some blogger in Williamsburg or Shoreditch who every once in awhile works up the will to march down the street and yell at some Jewish kids because they were, you know, born. Antisemitism isn't a scarecrow, it's a real issue, one I've dealt with (and I'm a Christian!) and I'm sure Mandieta6 has dealt with. Remember that BBC reporter who tweeted out that picture of an injured kid "in Gaza" that turned out to be a Syrian kid in Syria? That wasn't a mistake, it was deliberate, and it's a common media tactic.
The US has told Israel to chill, they've told them to do it several times. The Iron Dome was partly paid for by the US in hopes that it'd make them chill out, and to an extent it's worked. But Hamas kept launching rockets, kept digging tunnels, and eventually turned to kidnapping. Israel isn't America's dog, America can't just shout "sit!" and expect Israel to sit, it's a country with free will and a right to defend and even avenge its citizens. Do they go over the top sometimes? Absolutely. But there's a reason Egypt and Jordan don't run to Hamas' aid, they know what they're really about.
You want to see a country go way over the top? See what would happen if a country pulled a stunt like that on Russia. It'd be radioactive waste within a week.