“Worried about whom having them?”
Any bad guy/terrorist/gang common street thug. The possibilities are endless for how these things can be used to harm people or carry out all manner of crime. Imagine a drone with a load of explosives over a football game, etc. That technology is already available but so far no one has put it to use in a domestic setting here in the US.
> Any bad guy/terrorist/gang common street thug
I think you’re worrying about the wrong groups here.
Because the real group of concern refers to you with those terms.