Do you have specific evidence of this? Such as some sort of meta analysis that shows more pro-Israel stories making it through, and more pro-Palestine stories getting buried? Such an analysis would also need to account for differing quality as well. That is, you could say "100 pro-Palestine stories were banned, but only 10 pro-Israel stories were banned in this time period", but if 90 of those banned pro-Palestine stories were of the form "Israel sucks and Israeli citizens should all die", then I don't think that statistic would make your case.