But no parent would be willing to hear that within a year? Just other Palestinians who did not lose children?
And let's talk about agreement- How about a lot of the rest of the world? Would you say that most of the world would agree with you that Israel is justified in killing thousands of children for their military goals? If a majority, how big a majority? Can you back that up? If a minority, then it sounds less like it's justified and more like you personally consider it to be so, which is a different issue.
As I said, I think the vast majority of people who have lost a child do not ever want to debate whether the death was justified. Furthermore plenty of other people - Palestinian or otherwise - do not want to engage in a debate over Israel.
I have no idea how many people in the rest of the world agree with Israel, and it doesn't matter to me at all. I don't think it affects whether they are justified. There are plenty of things that are not justified even though they are very popular, and vice versa.
Morality usually comes from some sort of first principles. Some are religiously inspired, but I think it's much better to start with one or more moral philosophers.
If we simply put it to a vote, then we would likely conclude that slavery was moral in the 18th century.