I do not get it. It was just 3 storey building, really small too, why do not everyone jump out of the window? Broken legs are better than death, I guess. Number of deaths is like from some US shooting. Why? Again, it is not some WTC where you are blocked in trap and can't escape without suicide jump.
Movies really overplay how long you can last in a burning building before you die of smoke inhalation. It doesn't actually take that much smoke to kill you. Additionally, it being a small building works against them, as overcrowding would have made it difficult to get to windows. A number of people died on the 3rd floor and in the stairs trying to escape to the roof.
Even if you do jump out and break your legs (and at 3 stories, you're lucky if that's all that happens to you), you have no guarantee you can escape before the fire catches a pant leg or something, or a wall comes down on you. Most would try to get to the roof and wait for the fire department.
Also the arsonist literally poured gas onto people trying to escape, then set them on fire.