Because it is told from the perspective of the activity that is allowed. Now they could have technically been stated as the freedom from {Annoying/Harmful thing}* but thats still weak. The only reason to it is to take away power from the original argument by watering down the language it used. I'm sure the op didn't mean anything by it, I just happened to be listening to a conference call with a lot of corporate speak and was particular sensitive to how words are (mis)used
The actual point is that freedoms should be curtailed when they cause harm to others.
In this case unchecked freedom of movement can cause harm to society in different ways, so some forms of movement are restricted. Which is already true, we have signs, lights walls, fences, licenses, etc to restrict our movement. So the argument is really about how much more should they be restricted.
* EDIT, Zarath already called me out on that, but I still think it's a stretch
The actual point is that freedoms should be curtailed when they cause harm to others.
In this case unchecked freedom of movement can cause harm to society in different ways, so some forms of movement are restricted. Which is already true, we have signs, lights walls, fences, licenses, etc to restrict our movement. So the argument is really about how much more should they be restricted.
* EDIT, Zarath already called me out on that, but I still think it's a stretch