I'd be careful with the "they don't need it" argument. That is a mainstay of firearm prohibitionists, who are hip on deciding what you should be allowed to own based on their perceptions of what you need.
You don't need...
Nobody needs...
Why do you need...?
An example of a problem is police, who are civilians, using a BearCat in an operation against other civilians not engaged in violent activity. The problem is not that PDs can possess and drive BearCats.
Similarly, an example of a problem is a firearm owner committing murder, which already is illegal. The problem is not that people can possess and carry firearms.