It's not about happy vs. unhappy. It's about what's right and fair.
This
thread says it well and I'm glad the matter is getting the attention it deserves.
The number of unhappy people would increase if either of these policies were adopted and enforced. The reason is that under the current non-policy most people make reasonable accommodations for the preference of others, even if those others are selfish oafs.
A "one size fits all" policy cannot provide the same average level of customer satisfaction as a flexible non-policy. Given that different customers have different preferences, perfect customer satisfaction is not an option.