You are of course right, both sides have done terrible things to each other. For over 100 years. Many Zionist immigrants and later Israelis have been victims of Palestinian violence. And throughout all that time, there have always been at least 10 times more Palestinians who have fallen victim to Zionist violence.
But yes, when two groups lay claim to the same piece of land, then hatred and violence ensue, including blind violence against civilians, because people can be really shitty, we know that.
But there is also the question of who is in the right in this conflict, whose claim to the land is more valid. In my sense of justice, in this conflict the Palestinians are the natives who should have owned the land from the start.
And the Zionists immigrated to Palestine with the declared aim of establishing their own Jewish state there. And like real Europeans of the time, they gave practically no thought to what the people living there thought about it.
I think we have to keep in mind that, regardless of the violence, the Palestinians have been subjected to terrible injustice for over 100 years by the Zionists, by Israel and by their European allies around the world.