When the rioting comes, what do people buy? Something to defend themselves it turns out, and in the UK that's batons and baseball and cricket bats. Which are nice, but require you to get within a couple feet which is problematic, especially if you're outnumbered. But that never happens when you have to face a mob.
If only there were a way to defend yourself without needing to get within bad breath distance, and have some measure of "followup" that would mitigate being outnumbered. Alas.
And if such a device did exist, the public at large would never really need them. Right?