Thats only if you label people, people can have any outlook they want.
Theres a term called defencive pessimism, essentially meaning cynical people prepare for the worst outcome, usually well, with optimism that that preperation yields positive outcome.
I subscribe to the theory when riding my motorcycle, that i ride like everyone is out to get me, it prepares me for the worst and provides constant positive outcomes. Sames as in work, i risk assess the **** out of anything, with the view of avoiding disaster, the same way I coached rugby to a decent standard, injury prevention etc.
I bet you do it in your own life as well, all of our views and actions are situational and dynamic.
I dont see where the niaivity is in celebrating the long sought after bit of optimism for Palestinian people, it hasnt happened before, and could lead to peace.