Can someone explain why 'the internet'/twitter seems appears be wholly on the side of Palestine in this complex conflict? Is it as simple as it just being the default left-wing position?
Taking recent events at face value, you have Israel launching air strikes, claiming to be targeting militants hiding in civilian areas, killing some innocents in the process. I'm inclined to believe that they aren't using very expensive laser guided bombs to deliberately target random pockets innocent people, for capitalist reasons if nothing else. Debatable collateral damage.
Then you have Palestinian militants launching a barrage of hundreds of unguided rockets at populous Israeli cities. The fact that this is happening is not debated at all, is akin to indiscriminately shooting a gun into a crowd of people, & undoubtedly fits the definition of a warcrime.
I think it depends where you are looking - open source intel, etc. channels have a tendency to be slightly through to very pro-Israel and the comments a mix of both.
Israel has a policy where possible of alerting before using heavy munitions on a building but it is neither perfect or always adhered to (sometimes for operational reasons) and the Palestinians have less potential to do that even if they wanted to.