Earlier quoted context omitted.
You're right: it's the policy that's bad. However, facial recognition is what makes enforcing that policy possible, and society and the law haven't changed quickly enough to deal with the repercussions. For instance, say 18 year old "Joe" gets caught stealing soda from a fast food place. The manager kicks him out and bans him from the store. Fast forward a decade, when Joe walks back into the store with his wife and…
Why is the policy bad? They are preventing employees from a law firm in active litigation with them from attending their venues while the litigation takes place. It's not some draconian thing.
Besides, if the law firm really wanted someone in there for hand-wavy reasons, why would they not just hire someone for it? Blacklisting is petty, counter-productive, trivial to abuse, and solves nothing.