"So Israel is responsible to protect its citizens no matter what?"

• Israel is responsible to protect its citizens, while following applicable law. If your neighbor explicitly says he wants to kill your family and tries again and again and again, killing one of your babies each and every year. What options do you have? You must end this neighbor.
• What alternative do you see for Israel? Putting down their weapons and let their people eliminated? How many Holocausts are necessary?

source

"The end justify the means."

• Do you really imply that Israel applies inappropriate means?

And concerning the myth of "innocent civilians" in Gaza, I recommend reading @apshamilton: @apshamilton/gazans-are-not-victims-of-hamas-they-are-the-crucible-that-created-the-monster