I am not Lebanese but I am aware of all conflicts going in the region, Lebanon had the second largest number of Syrian refugees after Turkey and many of them are used there as cheap labour, so that also could go with what was mentioned earlier of corruption go hand in hand with incompetence, so getting a cheap labour to fix the door would mean very likely these people were not trained in handling or working in near proximity of dangerous chemicals, I think mentioning that they were Syrians would clarify the point, rather then accusing them of being the cause of the accident