Because it is an example of a right that is restricted.
More than that, it is an example of WHY rights are restricted - when it causes harm or creates an immediate danger to others.
When it doesn't, there's no basis for a restriction -- we don't restrict people because they -might- yell fire in a crowded theater, or -might- strap on a bunsh of exposicves and drive into a mosque, or because they -might- kill someone.
Why can’t I have a nuke?
Thus, your admission that you cannot demonstrate that my ownership/possession of AR15 harms someone.
Absent that demonstration, there's no sound argument for a restriction on my right to do so.
This only applies if you can demonstrate the harm caused by, or the clear, present and immediate danger created by, my ownership and possession of an AR15
Can you make such a demonstration?
No?
There you go.
How can anyone know you won’t use it for a mass killing?
The same way we don't know you won't become a serial rapist.
Since we don't know, its OK for the state to restrict your rights -- just in case you do.
Right?
Not really. A gun is a tool. That is it. Property. Religion is a state of being.
A distinction with no difference -- the fact you can still exercise a right in a certain manner in no way means restricting the exercise of a right in another manner does not diminish or violate that right.
Freedom of religion has restrictions. You can’t marry juveniles, have sex with animals, or walk around the city naked.
Because these fall outside the free exercise of religion and thus are not protected by the 1st. Apples.
My ownership of an AR15 falls under the right to keep and bear arms and is thus protected by the 2nd. Oranges.