This is a false dichotomy, of course you can be pro Palestinian but also reject an organisation that has committed horrendous crimes like Hamas. Hamas may justify their crimes as resistance but does killing babies and other civilians really constitute resistance or terrorism.
My own government, the ANC resisted apartheid by targeting infrastructure not civilians, they targeted the Apartment regime not white people, why the world supported the South African struggle and Nelson Mandela's ANC.
Glad we could justify the killing of a "baby" because America has killed more, at least 20. Nazi's also killed a couple of Jewish babies, what is just one more, it's not like Hamas target this specific baby, kidnapped the baby, refused to hand it back if it was really an error, not keep the baby as a hostage until the baby finally died of "natural death".
People it was a single baby, please support Hamas because not supporting them, even if the justifiably killed one baby (and not 20 if it was the USA), is basically not supporting Palestine and its people whom these acts of Hamas, like killing one tiny baby, are done in the Palestinian people's name.