I think guns are rather easy to misuse. Pull a gun out in an adrenaline rush and use it. Think someone broke into your home when it was just your daughter returning after sneaking out for a party. Forget that a gun was loaded, or leave it out for a relative to snatch when you're not looking.
These are all relatively easy mistakes to make, and they all happen, time and time again.
Fair, I suppose. I meant in the sense of ease of use. A gun is a simple machine.
Those same human error hypothetical situations can be applied to explosives and chemicals with potentially more disastrous results.