I think you are over-reaching on the effect of 2A. Most of the developed countries in the world do not have an armed population and still, people do not cut lines.
I have lived in India where lines do not generally exist and in US. I have seen the culture in India change from line cutting to following the line (generally). The biggest difference is caused by whether you believe you will get the service if you wait in the line.
If you have a service that is available for only the first 20, but you have 50 people waiting, line-cutting will happen. Railway tickets in India are a big example - when I was growing up, you rush to the beginning of the line since there were only small number of seats allocated to each station. Now, that it is computerized and you can book from anywhere to anywhere, people stay in the line since they know they will get the ticket.
Look at your last example - lack of service if you are not in the front will cause chaos.
I have lived in India where lines do not generally exist and in US. I have seen the culture in India change from line cutting to following the line (generally). The biggest difference is caused by whether you believe you will get the service if you wait in the line.
If you have a service that is available for only the first 20, but you have 50 people waiting, line-cutting will happen. Railway tickets in India are a big example - when I was growing up, you rush to the beginning of the line since there were only small number of seats allocated to each station. Now, that it is computerized and you can book from anywhere to anywhere, people stay in the line since they know they will get the ticket.
Look at your last example - lack of service if you are not in the front will cause chaos.