I'm not an authority on the matter either, and usually I stay far away from this debate. It is too complex and would be far too time consuming for me to do a good job of it. However, I've not seen even any semblance of proof that Israel at any point barged into Palestine in order to deliberately target and kidnap civilians and then parade a corpse of a naked girl with broken legs through their streets.
If someone can show me proof of that, perhaps I'll change my mind. Were there skirmishes between Israel and Palestine, where more Palestinians got hurt as a result of collateral damage? I'm sure there were. This is not the same as deliberately targeting civilians, however.
Other things I've seen: videos of kids (10 to 18 in age) in Palestine crowding around the cars with hostages in them, chanting "Allah Hu Akbar". What sort of damned culture brainwashes and raises their kids to take part in events like this? Wtf. This doesn't inspire any sympathy in me either.