Is there any doubt? When you target civilians rather than military and government people and institutions. You are a terrorist. When you hide among civilians including tunnels under hospitals and refugee camps, you are a terrorist. Hamas looks for mass civilian casualties for both terror effect and news headlines. Terrorist organizations need to be eradicated.
I have sympathy for those who do not support the terrorist and just want to live their lives but are caught in the middle. I have no sympathy for those who support, protect and enable the terrorists.