I don't know what to say when it comes to that kind of stuff but I think that before the World Cup began, I already expected and assumed that Qatar will be friendly enough and will cut the foreigners some slack as it will be safe to say that not all of them are knowledgeable enough to know what is prohibited in Qatar or in other Islamic countries.
I've already read about this, there are some instances that the citizens were mad because of the unconscious act made by the tourists but they cannot do anything about it as their own country is even turning a blind eye about what happened. The only thing the Qatar strongly enforced was banning of any addictive substance including alcohol and smoking.
I am all for a respectful approach to other religions or beliefs in general, but it should not be forgotten that it is not only the tourists from the Western World who either intentionally or even unintentionally violate some laws or customs, it is also people with Muslim beliefs who are free to practice their religion in Western countries often times even when some of the stuff is not entirely legal. I think to shut one eye is not asking too much as this benefits everyone. Of course, if there are violations of the most important laws in a country, that is problematic, but those laws should still be in agreement with human rights conventions and that is where it gets problematic. But as far as I have heard at least the tourists felt mostly safe and comfortable for the time the World Cup took place.