So since Americans have a right to own guns, do gun shops have to sell to anyone?
Since alcoholism is a disability, do liquor stores and bars have to serve drunks?
If people can cross our border illegally and get away with it, why are bakers required to make cakes?
Well, in this case, it’s something specified in the law. In regards to drunks, you can be criminally liable if you serve a drunk and you can lose your liquor license. In regards to guns, who you can sell to and “how” is specified, too.