Your totally ignore the key element here: a new technology is allowing denying entry at a whole new scale. Nobody really has an objection to organization blocking a single individual who is might cause trouble. But blocking an entire class of people is a) newly enabled* and b) much more harmful to society.
If a venue kicked out a lawyer who was actively working on a lawsuit against the venue, nobody would bat an eye. But kicking out every person on payroll at any firm that has a lawsuit against any venue in the parent company, the scale has now transformed this into a different thing.
The next step people worry about is that this same technology could be applied to more than just busniess you dislike. Why not block people who have disparaged your business on social media? Why not block people with poor credit scores or a criminal history?
So you could draw a line between (3) and (4), but you should also be adding
5. I, as a business owner, should I not be allowed to invent new ways to deny entry to entire categories of people.
* obviously blocking people on visual characteristics like skin color is already possible. And that is widely regarded as unacceptable!
If a venue kicked out a lawyer who was actively working on a lawsuit against the venue, nobody would bat an eye. But kicking out every person on payroll at any firm that has a lawsuit against any venue in the parent company, the scale has now transformed this into a different thing.
The next step people worry about is that this same technology could be applied to more than just busniess you dislike. Why not block people who have disparaged your business on social media? Why not block people with poor credit scores or a criminal history?
So you could draw a line between (3) and (4), but you should also be adding
5. I, as a business owner, should I not be allowed to invent new ways to deny entry to entire categories of people.
* obviously blocking people on visual characteristics like skin color is already possible. And that is widely regarded as unacceptable!