When people see what is happening in Gaza, that can't make you too fond of the perpetrators - the Israelis. If you are a Muslim and you look at what is happening there, it fills you with a lot of resentment. Especially if you are weak, then you are nursing these grudges and you are increasing in bitterness and look for a chance to get your own back.
True forgiveness deals with the past, all of the past, to make the future possible. We cannot go on nursing grudges even vicariously for those who cannot speak for themselves any longer. We have to accept that we do what we do for generations past, present and yet to come. That is what makes a community a community or a people a people-for better or for worse.
Nursing a grudge is bad for your heath.