If it happen once or twice, then maybe close one eye. If it happens too often, then something is not right. Can't possibly always use the same reason all the time and push it to the workers. It means that the workers they engage have issue with time management It indirectly reflected bad on the ID and the company as well, for using such workers. It's just like in a company, if you are the boss, your workers do a bad job, can you tell your customers it's your workers fault not your fault? Even if you outsource your job to 3rd party, somehow you got to be liable for it.