I have been to many 'Indian', balti, curry restaurants, call them what you will, and the vast majority were owned and staffed by Muslims. Most sold alcohol, those that didn't have a licence were happy for me to 'bring my own' and provided the glasses, corkscrews and disposed of the bottles/cans. Back in the 70s these restaurants became very popular with the pub goers as they served alcohol when the pubs were shut, but only to diners to comply with the laws.
There will always be a minority of people in every type of society that are sticklers for what they believe to the rules, or the only way to do things.