However, it does not mean that anger is justified, and it does not justify attacks on civilians.
Don't try to justify Israel to me because you will look stupid when I list for you Israeli sources admitting Israel's aggression.
Starting with the Israeli national archives which have detailed the ethnic cleansing in 1948.
Stay on topic. Don't justify Israel. Just don't go there. Please.
Particularly drone "signature strikes" against first responders, which have killed MANY more people than 911.
Decide which standard you want to have, and then realize that it applies to your favoured side too.
Which by the way started most of the problems in the first place.
However, it does not mean that anger is justified, and it does not justify attacks on civilians.