Many factors here, but the primary IMO is likely to be the lack of safety culture in the airline, leading to multiple deviations and unsafe acts. Looking at the approach, it should have been called off long before it came close to the ground and not for the landing gear. Why did they continue? Those acts and attitudes are tolerated and the (human and technological) controls don't exist to prevent them. The sad part is that these crews are usually not the first ones by far to have these lapses, just the ones that end up holding the bag at the end of the game. That doesn't excuse their lack of airmanship, but them thinking their actions were "ok" on the approach is something that started in the company a long time before this.