Yes it is ok. Oppressed people are allowed to resist.
Every educated Jew holds highly critical opinions of Israels fascist ways, simply look at Einstein to see this view reflected:
When a real and final catastrophe should befall us in Palestine the first responsible for it would be the British and the second responsible for it the Terrorist organizations build up from our own ranks. I am not willing to see anybody associated with those misled and criminal people.
or
Should we be unable to find a way to honest cooperation and honest pacts with the Arabs, then we have learned absolutely nothing during our two thousand years of suffering and deserve all that will come to us.