I think you got your history messed up. The roommate has always been there and the landlord at that time intended for both of you to live side by side, but you refused, and brought your neighbours to attack your roommate but your roomate emerged victorious. Your neighbour then took part of your room before your roommate took them back. Some times later, your roommate gave it back to you, but you keep threatening to eliminate your roommate. So your roommate had no choice but to prevent you from killing them.
If you see history as it is, you'll get a new perspective on how events unfold. Undeniably hamas is a terrorists organization who hides behind innocent civilians, and israel is exaggerated in their response, but I can see from their point of view because I see history as it is. This is a war between israel and hamas, and like any other war, unfortunately there are casualties among the civilians (which is very difficult to prevent as long as hamas hides behind them).