Suppose if you had been to the same restaurant with your kids, what would you have done? You would probably have taken your kids out, and similarly the other parents would have done the same. And in the end the two smokers would have told the manager " See no kids here so we can smoke"

(Once you run from a situation, you always keep on running)

Although it is not an Arabs thing only, many other races and nationalities have a tendency not to follow the rules. As the rule enforcement agencies do not wish so or dont have the power or they dont punish those who vandalise the law