The Israeli govt is cutting off essential supplies to the entire Gaza strip, including food and drinking water, and is indiscriminately killing and bombing swathes of civilians if there is so much as a rumour of a single Hamas fighter in the area. They literally bombed a refugee camp for this reason.
Meanwhile, Hamas has less access to military gear but are no more discriminate in their targets. Israeli civilians, IDF soldiers, it's all the same to them. In a single day, they killed more than 1000 Israeli civilians, and that was just the incident that started this escalation.